https://trends.google.com/explore?q=facebook&date=all&geo=US
and maybe Zuck doesn't think he can do anything about it. There are different theories but i like this one:
-- originally you would put some imagination and elbow grease into using Facebook and get some intention which made it very attractive and interesting to people around 2010
-- then it found a business model which was dependent on your not being able to use imagination and elbow grease to get attention which made it less interesting in general but still somewhat interesting because now you could put cash into the slot machine and get cash out
-- over time they lowered the payout of the slot machine which made the game less interesting and more dependent on 100% profitable scams which could function no matter how bad the payout was; people lose trust in the platform and stop engaging with ads, real advertisers don't want to be seen next to scam ads (lest they be seen as scams) which further lowers the payout and makes the game less interesting over time
-- and now they won't even take your money... so who cares?
I think it is more like radioactive decay than say, cheese going bad, but maybe I'm wrong. You can't smell the radioactive decay!
The game is rigged, also Instagram and Whatsapp (yeah, companies get acquired. but WA's Acton was very explicit - "delete Facebook" (also, ever tried deleting FB? almost impossible. more network effects). he was pissed off at what happened)
Once I started using the social features on my MQ3 I found it really was Zuck's worst nightmare. I met all these nice retirees who were fun to play Beat Saber with and who would go on cruises and post YouTube links to pano videos they take of the ship.