I do agree that engagement farming is—and has been—a problem, but as someone that worked in social media (mostly on the data side, fwiw), it's been a problem for like a decade+ now, long predating "modern" Twitter. And it's a consistent problem on all platforms (I mostly use Instagram, and it's annoying on there as well).
The difference between Twitter now and Twitter a decade ago isn't in the quantity of vapid interactions; it's the proportion of that to anything else. The slide started a long, long time ago and at some point effectively no one was trying to stop it anymore. I'm sure there are still corners where useful information gets passed on in a timely manner, but like the citizens of so many venues before it those corners have been diminished and isolated to an extent that it no longer feels worthwhile for those not already entrenched in them to bother seeking them out
And my point was that, from what I can tell, that proportion of trash::value has been increasing on all social media in (more or less) lockstep. If anything, I'd say Facebook has seen the most precipitous drop in quality, not Twitter. So much so that I don't even log in anymore, and I was veritably addicted during college.
I even get sucked into contributing at times, which is why that descent into trash _works_ so well. I hate it, and I visit HN less and less as a result.