It probably only takes a staff on the order of a thousand people to make things go viral on the internet.
If it's your job to just sign up for social media accounts (fill in the the captchas, type in a name, upload a few images) you could easily create at least a hundred per day.Multiply that by a thousand and that's one hundred thousand accounts per day.
Of course you'd have to post some comments occasionally to make it look real. But that would just be re-wording the text from other comments. Of course if someone were to do this, youtube comments would look like, well... exactly like youtube comments are like right now.
So figure a a hundred thousand accounts per week with comments to make it look legit, that's millions of accounts per year. Yeah you'd want to space it out a bit so it wouldn't look suspicious. And you'd need to route the traffic through a botnet so the IPs are from the same country the account claims to be from. But within a year you'd have millions of accounts that all appear legit to any automated system checking them.
So now you've got the accounts and you want something to go viral. Have your thousand people start logging into accounts and running the video or whatever through your botnet, click like, leave a comment, maybe even check out the ad so the social media company makes a bit of money and aren't incentivized to look at it too closely. This probably only takes around 10 seconds per account. You could have anything you want have at least a million likes and engagement within a day. Which is probably way more than is needed for the algorithms to start recommending the content to legitimate users. And then it's all automatic from there.
Sure a few thousand people sounds like a lot. But not for the government of a country that wants to do disinformation.
The economics term for this is price discrimination. Nothing to do with racial discrimination, it's discriminating based on willingness to pay.
But usually it's not done by raising the prices above normal it's done by setting the regular prices higher and then offering a discount to people who aren't willing to pay less. People tend not to get upset when it's done that way. Student discount at the movie theater is a form of price discrimination. People accept it because they're being nice to people that don't have a lot of money. Seniors discount? Also being nice, I guess. But the reality is they know everyone else is willing to pay more so they charge more.
And this has already been happening online. About a decade ago I noticed what when I searched for flights from an airline then went to facebook, I'd get an ad from that airline offering a discount. Not as sophisticated as attempting to determining the exact price I was willing to pay, but it's along the same lines.
But the problems with these schemes is that people quickly figure out the system. I just made it a habit to search for a flight, then go onto facebook to look for the discount even when I'd be willing to pay even if there was no discount. But why not trick the system into thinking I didn't really care about booking the flight and get that discount?