It is absolutely atrocious to use and constantly tries to ram Algorithmic crap down your through. The thing is, most normies are there and for every person who is Internet savvy enough to see the benefit of Mastodon and Lemmy (and Pixelfed, etc) there are a dozen normies who don’t and can’t be bothered finding out.
I would not say that Facebook is popular, but I will say that it is common. It is literally the Lowest Common Denominator for port of social interaction on the Internet.
As evil as Graham Lineham is, I do need to post the parody of these forwarders that was in The IT Crowd.
https://www.youtube.com/watch?v=ALZZx1xmAzg