I’m on Twitter but not FB. I haven’t opened the twitter app or been to the site in well over a year, it could be two.
I think what happened is that for it (Twitter) be be worth visiting you need to follow a reasonable number of people whether that be friends or celebrities or whatever. So you start accepting the “Others you follow also follow these” recommendations.
Not everyone posts/tweets regularly but on average there might be five tweets a day from each person (just a guess) so that’s five times the number of people you follow. That can be a lot of things to read and keep track of so unless you check constantly then stuff just falls by the wayside.
After a while I just couldn’t be bothered, things were too “scatter gun” with no cohesion.