I have a theory that although a lot of it is probably meaningless engagement bait on Facebook, like those posts with easy math questions or simply "Share X if you agree with Y", there is this distinct genre of post that seems to target boomers or less tech savvy folks.
Usually goes something like "URGENT - Facebook is changing x y z on April 15, this means [something terrible] but you can opt out just copy paste this paragraph into your personal page"
I suspect those types are meant to compile a list of accounts that are
active
not tech savvy
gullible
to target or exploit somehow.
Edit: sorry this reply started more on topic when I started typing and then went semi/unrelated to your main points. I'll blame sleepy time.
On topic though, maybe Facebook and YT comments need AI built in so all the comments can be @Grok IS THIS TRUE instead :P
@Grok IS THIS TRUEinstead :P