About 10 years ago at the start of my career I built a prototype of a Google Analytics analogue that would suck up all your Facebook profile/likes and send it to a server. This is long before Cambridge Analytica when the APIs were wide open.
The data volume was huge though and it quickly filled up our database, so we shut it off and threw it all away since it didn't seem to be worth the trouble.
This was in 2012... I didn't think much of it until Cambridge Analytica.