this post was submitted on 29 Mar 2025
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So check it out: Mastodon decided to implement follower-only posts for their users. All good. They did it in a way where they were still broadcasting those posts (described as "private") in a format that other servers could easily wind up erroneously showing them to random people. That's not ideal.

Probably the clearest explanation of the root of the problem is this:

Something you may not know about Mastodon's privacy settings is that they are recommendations, not demands. This means that it is up to each individual server whether or not it chooses to enforce them. For example, you may mark your post with unlisted, which indicates that servers shouldn't display the post on their global timelines, but servers which don't implement the unlisted privacy setting still can (and do).

Servers don't necessarily disregard Mastodon's privacy settings for malicious reasons. Mastodon's privacy settings aren't a part of the original OStatus protocol, and servers which don't run a recent version of the Mastodon software simply aren't configured to recognize them. This means that unlisted, private, or even direct posts may end up in places you didn't expect on one of these servers—like in the public timeline, or a user's reblogs.

That is super relevant for "private" posts by Mastodon. They fall into the same category as how you've been voting on Lemmy posts and comments: This stuff seems private, because it's being hidden in your UI, but it's actually being broadcasted out to random untrusted servers behind the scenes, and some server software is going to expose it. It's simply going to happen. You need to be aware of that. Even if it's not shown in your UI, it is available.

Anyway, Pixelfed had a bug in its handling of those types of posts, which meant that in some circumstances it would show them to everyone. Somebody wrote on her blog about how her partner has been posting sensitive information as "private," and Pixelfed was exposing it, and how it's a massive problem. For some reason, Dansup (Pixelfed author) taking it seriously and fixing the problem and pushing out a new version within a few days only made this person more upset, because in her (IMO incorrect) opinion, the way Dansup had done it was wrong.

I think the blog-writer is just mistaken about some of the technical issues involved. It sounds like she's planning on telling her partner that it's still okay to be posting her private stuff on Mastodon, marked "private," now that Pixelfed and only Pixelfed has fixed the issue. I think that's a huge mistake for reasons that should be obvious. It sounds like she's very upset that Dansup made it explicit that he was fixing this issue, thinking that even exposing it in commit comments (which as we know get way more readership than blog posts) would mean people knew about it, and the less people that knew about it, the safer her partner's information would be since she is continuing to do this apparently. You will not be surprised to discover that I think that type of thinking is also a mistake.

That's not even what I want to talk about, though. I have done security-related work professionally before, so maybe I look at this stuff from a different perspective than this lady does. What I want to talk about is this type of comments on Lemmy, when this situation got posted here under the title "Pixelfed leaks private posts from other Fediverse instances":

Non-malicious servers aren’t supposed to do what Pixelfed did.

Pixelfed got caught with its pants down

rtfm and do NOT give a rest to bad behaving software

dansup remains either incompetent for implementing badly something easy or toxic for federating ignoring what the federation requires

i completely blame pixelfed here: it breaks trust in transit and that’s unacceptable because it makes the system untrustworthy

periodic reminder to not touch dansup software and to move away from pixelfed and loops

dansup is not competent and quite problematic and it’s not even over

developers with less funding (even 0) contributed way more to fedi, they’re just less vocal

dansup is all bark no bite, stop falling for it

dansup showed quite some incompetence in handling security, delivering features, communicating clearly and honestly and treating properly third party devs

I sort of started out in the ensuing conversation just explaining the issues involved, because they are subtle, but there are people who are still sending me messages a day later insisting that Dansup is a big piece of shit and he broke the internet on purpose. They're also consistently upset, among other reasons, that he's getting paid because people like the stuff he made and gave away, and chose to back his Kickstarter. Very upset. I keep hearing about it.

This is not the first time, or even the first time with Dansup. From time to time, I see this with some kind of person on the Fediverse who's doing something. Usually someone who's giving away their time to do something for everyone else. Then there's some giant outcry that they are "problematic" or awful on purpose in some way. With Dansup at least, every time I've looked at it, it's mostly been trumped-up nonsense. The worst it ever is, in actuality, is "he got mad and posted an angry status HOW DARE HE." Usually it is based more or less on nothing.

Dansup isn't just a person making free software, who sometimes posts angry unreasonable statuses or gets embroiled in drama for some reason because he is human and has human emotions. He's the worst. He is toxic and unhinged. He is keeping his Loops code secret and breaking his promises. He makes money. He broke privacy for everyone (no don't tell me any details about the protocol or why he didn't he broke it for everyone) (and don't tell me he fixed it in a few days and pushed out a new version that just makes it worse because he put it in the notes and it'll be hard for people to upgrade anyway so it doesn't count)

And so on.

Some particular moderator isn't just a person who sometimes makes poor moderation decisions and then doubles down on them. No, he is:

a racist and a zionist and will do whatever he can to delete pro-Palestinian posts, or posts that criticize Israel.

a vile, racist, zionist piece of shit, and anyone who defends or supports him is sitting at the table with him and accepts those labels for themselves.

And so on. The exact same pattern happened with a different lemmy.world mod who was extensively harassed for months for various made-up bullshit, all the way up until the time where he (related or not) decided to stop modding altogether.

It's weird. Why are people so vindictive and personal, and why do they double down so enthusiastically about taking it to this personal place where this person involved is being bad on purpose and needs to be attacked for being horrible, instead of just being a normal person with a variety of normal human failings as we all have? Why are people so un-amenable to someone trying to say "actually it's not that simple", to the point that a day later my inbox is still getting peppered with insistences that Dansup is the worst on this private-posts issue, and I'm completely wrong and incompetent for thinking otherwise and all the references I've been digging up and sending to try to illustrate the point are just more proof that I'm horrible?

Guys: Chill out.

I would just recommend, if you are one of these people that likes to double down on all this stuff and get all amped-up about how some particular fediverse person is "problematic" or "toxic" or various other vague insinuations, or you feel the need to bring up all kinds of past drama any time anything at all happens with the person, that you not.

I am probably guilty of this sometimes. I definitely like to give people hell sometimes, if in my opinion they are doing something that's causing a problem. But the extent to which the fediverse seems to like to do this stuff just seems really extreme to me, and a lot of times what it's based on is just weird petty bullying nonsense.

Just take it it with a grain of salt, too, if you see it, is also what I'm saying. Whether it comes from me or whoever. A lot of times, the issue doesn't look like such a huge deal once you strip away the histrionics and the assumption that everyone's being malicious on purpose. Doubly so if the emotion and the innuendo is running way ahead of what the actual facts are.

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[–] OpenStars@piefed.social 5 points 4 days ago (1 children)

A highly relevant post, particularly the part "Address the Elephants in the Room". Just imagine, for a moment, if all the people who were banned from Reddit for being too toxic were to come over here? In that case you would get... Lemmy.

Yet we are here as well. It is an odd mixture. And it is why we aren't really growing (well, barely) despite all the fuck-ups done by Huffman. Meanwhile e.g. Bluesky is really gathering people together! That's the difference that listening to people makes: they go where there's a nice environment, which addresses their concerns, in large part bc it makes them feel heard.

People most definitely don't come to Lemmy to be heard. Well, to be more precise, they do not stay once they learn that it isn't going to happen, without MAJOR efforts on their part to block a goodly fraction of the Lemmy userbase that will not control their own words, hence making anyone who does not enjoy listening to such need to put in the work to do that for them.

[–] PhilipTheBucket@ponder.cat 1 points 4 days ago (1 children)

Yeah. That's one thing I think Piefed is really doing right. They're trying to make it so that normal people will have a fairly pleasant normal-person experience.

I think Lemmy's core developers including explicit acceptance for toxic online behavior, and some of the original core instances openly celebrating and modeling it, really may ruin the platform for the long term. And yes, you and dubvee are completely right as far as the lack of action in any respect by a lot of people who run the instances to do all that much of substance about the people who seem to want to ruin the experience on those instances.

[–] OpenStars@piefed.social 2 points 3 days ago

You can read in my (successful) Petition to defederate from hexbear.net some stories not only about that instance but also some for Lemmy.ml, including an incident where a mod told a user that they (the mod) wanted to kill them (the OP), then double and tripled down on that thought, all entirely protected by the admins (discussed further here).

When I first considered leaving Reddit, this kind of thing gave me strong pause, and it was only the fact that Kbin.social also existed that got me even a toe-hold into the Lemmyverse. This despite me not caring about Mastodon and thus any of its Microblogs, which lead to me mostly interacting with Lemmy magazines remotely, though with different sorting metrics which did help a little for me to see content that was not merely highly upvoted by people using Lemmy (including hexbear.net, lemmy.ml, etc.) and instead prioritized more by like-minded people using Kbin, and then later Mbin.

PieFed goes MUCH further, providing not merely different voting metrics on mostly the same content but actual tools that even pro-authoritarian Lemmy users want (categories of communities, combined comments across cross-posts, hashtags, etc.), as well as people who want the opposite, it's really extremely flexible.

And I think PieFed is the only hope for the Threadiverse to go mainstream. I'm not saying that I think that we necessarily will, or even that we all want to or should, just that if it were to happen, it won't happen with Lemmy. I'm currently at 100% of people I've told about it irl actively chiding me for having so much as recommended it, which makes a great deal of sense only once you realize that (i) a Google search pulls up lemmy.ml as the top instance, (ii) that instance shows Local rather than All by default, and thus (iii) what someone will be exposed to is content making fun of Western society. Mainstream normal people don't want that! I don't want it either! We learn how to block it, but mainstream normal people don't want to expend hours upon hours to make Lemmy usable - and by hours I mean like tens of, continually, as they keep swatting off the bullies, but there are always more.

The alternative would be to make better mod tools. Which on Lemmy are barely happening, extremely slowly. PieFed is still catching up to Lemmy in terms of base features though, e.g. there is a Preview option but only for posts but not for comments, and many Notifications point to things to read but then won't actually show you the thing when you click on it (due to many reasons, possibly having been removed in the meantime, or being hidden by an auto-collapse or auto-hide feature, or you've blocked all the users from an instance but nonetheless notifications are still sent, etc.) - i.e. it still needs some polish. Hence in the meantime I am not recommending Threadiverse tools to anyone irl atm, unless they are already reading something here and then I recommend to check out PieFed:-).

[–] FozzyOsbourne@lemm.ee 32 points 6 days ago (1 children)

Why are people so vindictive and personal, and why do they double down so enthusiastically about taking it to this personal place where this person involved is being bad on purpose and needs to be attacked for being horrible, instead of just being a normal person with a variety of normal human failings as we all have?

First time on the internet? This happens everywhere, more so when you're anonymous or pseudonymous, but whenever you're behind a screen and everyone on the other side is just a username being controlled by an idiot or a troll.

[–] SouthEndSunset@lemm.ee 10 points 6 days ago (3 children)

Agreed. Reddit and Twitter were bad for bullying, doxxing, or just general nastiness, I’m not saying that it doesn’t happen on Mastodon, or the Fediverse in general, but it’s nothing like as bad.

[–] Demdaru@lemmy.world 12 points 6 days ago (1 children)

Until someone does something not FOSS'y or anti-linux.

[–] Ofiuco@lemmy.cafe 7 points 6 days ago

Or you try to tell them the government they are cheering for is not a leftist one, people here loves to defend them based only on the propaganda that reaches them and get MAD if you don't join the yes-wave.

[–] Kirk@startrek.website 7 points 6 days ago

If Mastodon/Fedi was at the scale those platforms are we would see more harassment, absolutely. It remains to be proven but I think federation enables a lot more eyes on content which implies harassing material can be removed more quickly.

Federation/decentralization solves a lot of problems over centralized social media, but ultimatley you can't engineer human nature.

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[–] RobotToaster@mander.xyz 36 points 6 days ago (2 children)

This guy is being reasonable, get the pitchforks!

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[–] Kirk@startrek.website 23 points 6 days ago (2 children)

People get so weird about Dansup.

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[–] rikudou@lemmings.world 15 points 6 days ago (3 children)

Who would've thunk that misusing the same type for both public and private posts (with a sprinkle of weird mention rules to determine the visibility) could backfire?

Well, definitely not Mastodon devs. Lemmy's current approach of using an entirely different type is much better.

If you're interested in some details, I recently wrote a comment about it: https://lemmyverse.link/lemmings.world/comment/14476151

[–] PhilipTheBucket@ponder.cat 7 points 6 days ago (1 children)

Yeah, the whole thing of "if #public is in to and the user is in cc, it means one thing, but if it's the other way around, it means something different" just reeks of "IDK I just wanted to hack it up and move on and IDGAF how platforms other than Mastodon are going to wind up handling it." Which is fine... as long as your users universally understand that that's your level of care towards honoring non-public visibility settings they're setting on their posts.

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[–] scrubbles@poptalk.scrubbles.tech 17 points 1 week ago (13 children)

I'm gonna go out on a limb here and say you're both wrong. Here me out.

As other commenters have said, there should never be any expectation of privacy on the fediverse. DMs here and private items are not actually private, they're quite literally blasted out to anyone who listens. I feel like I have to say that a lot. I actually like how Lemmy handles it, it warns you that it's unencrypted and that it recommends Matrix (and you can put your matrix handle on your profile).

However. I'm also disillusioned by Dansup. He made a great project with Pixelfed. It got off the ground and has a great following. However, I've read through the code, I've tried to spin it up, hell even tried to help contribute - but it's a spaghetti'd mess of unmaintainable code. What irks me is rather than dive in and fix the code, help those who honestly want to spin up his projects, he starts a completely separate project (off the same spaghetti'd base that barely scales), and goes on a whole PR junket talking about it. Then when I see people asking questions of his code or how to do things he usually jumps down their throats - or completely ignores them.

And honestly the biggest thing that irked me was that I didn't feel he gave credit to the hundreds - thousands of other people who work to make the fediverse work. Pixelfed is a great experience - but it's one of many all working together, and the developers are a huge chunk, but you have the infrastructure, us admins hosting, those out there vocalizing it, those trying to start communities, it's an ecosystem, and I just felt like he ignored the fediverse and instead pushed Pixelfed.

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[–] Ulrich@feddit.org 4 points 5 days ago* (last edited 5 days ago)

IMO, Dan has some responsibility but more of it lies with Mastodon and other microblogging software that labels this post type as "private", "followers only" or similar without any further explanation. It needs to be clear that it's dependent on good faith and competence of remote servers that may collect that information.

Moreover we need to do a better job of letting users know that anything posted on the internet, and especially anything posted to the fediverse where it's backed up on potentially thousands of servers, should be assumed to be publicly-visible and eternal. If nothing else, it will be backed up on the internet archive. If you want to communicate privately, this is the wrong place.

I wish there was a private social media platform but it seems like the closest we're going to get is Signal.

Also "the bullying problem" has nothing to do with the Fediverse and everything to do with people in general and the erosion of nuance.

[–] freamon@preferred.social 13 points 6 days ago (1 children)

I don't think that blog author is male, btw.

[–] PhilipTheBucket@ponder.cat 15 points 6 days ago

Oop. She is not. Fixed.

[–] TORFdot0@lemmy.world 9 points 6 days ago (4 children)

When I first started the reading I figured the person being bullied was the woman who was upset with dan because her concern about disclosure wasn’t really reasonable. I don’t think the bullying problem is innate to the fediverse, and thankfully we have a lot of tools to safely navigate the fediverse and tune out the abuse.

But there is a not insignificant portion of folks on here that are here because they were banned or warned on mainstream platforms because they couldn’t regulate themselves and still aren’t regulating themselves.

The vast majority of people I’ve came across are genuinely kind. Dansup doesn’t exactly follow best practices in his development which I think causes a lot of strife in the segment of the fedi population who can’t regulate when someone does something they don’t agree with.

I don’t agree with how he has handled loops so I just don’t use it. I don’t think ill of Dan at all.

[–] rikudou@lemmings.world 7 points 6 days ago

I don't exactly think ill of him, but I'll stay away from any platform he creates. He shared one snippet of code where he disabled validating certificate validity and certificate names. When called out on it, he decided to delete the post.

Security and standards don't seem like the first things on his mind.

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[–] AntiBullyRanger@ani.social 7 points 6 days ago* (last edited 6 days ago) (1 children)

Back when I was younger and naïve, I would Nicolas Cage OP.

I'm now more mature and open minded, and I can say I wholesomely agree with @Zak@lemmy.world’s statement ITT.

Technologists have very little patience for people that are technologically illiterate. And when you're fighting to liberate people against corporations that send hitlists against you, patience runs faster. My hope is that people like OP can empathize that while yes, public technologies can be harmful and downright hostile, they can take their time to comprehend concepts technologist took their time to write down and document for.

If you want private conversations with peers, it must be encrypted, it must be forward secret, and it must be authenticatable.

XMPP, SimpleXchat, & Signal are the only three that fit these specifications.

I have the first two (check my bio👈😎👈), the latter I do not trust.

[–] GreenMartian@lemmy.dbzer0.com 13 points 6 days ago (8 children)

the latter I do not trust.

Am I reading the article wrong? Is it not a good thing that they refused to comply with the hostile anti-encryption law?

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[–] brrt@sh.itjust.works 7 points 6 days ago (2 children)

It sounds like she's very upset that Dansup made it explicit that he was fixing this issue, thinking that even exposing it in commit comments (which as we know get way more readership than blog posts) would mean people knew about it, and the less people that knew about it, the safer her partner's information would be since she is continuing to do this apparently. You will not be surprised to discover that I think that type of thinking is also a mistake.

I agreed with you at first because from your description it sounded like she was saying security through obscurity was a good thing. But that’s not the case.

What she’s saying in the blog post is that this a 0-day and should be handled according to the best practices for 0-day disclosure.

You have to decide if you want to

  • publish the findings before the fix -> more people will know and exploit the vulnerability but users might be aware and may or may not be able to mitigate sharing even more
  • publish the findings after the fix -> the opposite

I don’t pretend to know enough to judge which option is the best. But I can’t fault the blog author for pointing out that Dansup didn’t follow best practices.

[–] AwesomeLowlander@sh.itjust.works 14 points 6 days ago (7 children)

more people will know and exploit the vulnerability

It's not even a vulnerability, it's how AP works by design, is the issue at hand here. Mastodon decided they wanted to implement something not supported by AP, and everybody else had to take the heat for not 'doing it right'.

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[–] skullgiver@popplesburger.hilciferous.nl 10 points 6 days ago (2 children)

I don't think dansup was in the wrong here. Yes, it's a security issue I suppose, but the problem lies within the underlying protocol. Any server you interact with can ignore any privacy markers you add to posts, you're just not supposed to do that.

Whether this is a 0day depends on what you expect out of the Fediverse. If you treat it like a medium where every user or server has the potential to be hostile, like you probably should, this is a mere validation logic bug. If you treat it like the social media many of its servers are trying to be, it's a gross violation of your basic privacy expectations.

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