Thanks for the help, everybody!
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The grumpy answer: Don't mix and match across platforms.
They are very different platforms that serve very different purposes, and they have very different layouts. Viewing things from different instances using the same service works quite well, but even when cross-platform things work, it's not a great experience.
If you want to see stuff on Mastodon server, use a Mastodon account. If you want to see something on Pixelfed, use a pixelfed account, if you want to see stuff on Lemmy, use a Lemmy account.
But doesn't that defeat the point of federation?
I think the main point of federation is being able to see something from Lemmy.zip with an account on Lemmy.ca. So if one service goes down, or a there is a difference of opinion on what the rules should be, the whole platform of "Lemmy" doesn't go up in flames.
This prevents one person or group from controlling everything.
Oh ok.
Not entirely. While you can interact with content from other social platforms like Mastodon and PeerTube from Lemmy, federation is best experienced when you utilize platforms with similar use cases.
For example, the link aggregators (Reddit-likes) on the fediverse are Lemmy, PieFed, Mbin, and until recently, Lotide. Each of these platforms have similar looks and purpose with slight differentiation. While you can communicate with video streaming or microblogging like PeerTube and Mastodon respectively, it's best to stay within the link aggregators and make a new account for those purposes.
To give an example with microblogging on the Fediverse, there's also a number of options. Biggest one is Mastodon, but others include Misskey and it's endless forks, Smithereen, Pleroma/Akkoma, Mitra, Threads, etc. all with their own interesting quirks. While they can interact with Lemmy and whatnot, their best interactions are going to be with similar-purposed platforms.
Is there a way to crosspost across accounts on the different platforms? For example, is there a way to link posts on my Lemmy and Pixefed accounts to my Mastodon account?
Immediate thought that comes to mind is that you can follow the Lemmy and Pixelfed accounts from your Mastodon, which would give you some ease in accessing their posts via Mastodon, and then boost the posts from there.
Hope that helps a bit, tbf cross-platform interactions like this are something I have very limited experience with.
the mbin platform can access both thread and microblog stuff like mastodon from a single account