Facebook is total garbage anymore and crazy toxis it honestly brings out the worst in 90% of their userbase.
I went to delete it myself a few weeks back but ended up finding out I had a number of accounts I use elsewhere for facebook logins so ended up keeping it. But did remove any and all other information possible such as birthday etc.
Still it seems like today I had a few login attempts to some accounts linked to the facebook email address so I am sure I was one of those 50m.