Phinnaeus while you're highly entertaining I'm afraid you're looking at facebook bots.
Not sure what you mean by Facebook Bots, but the majority of the FB pages I've addressed were created on September 10, 2012, some of which recently point toward Bitcoin entities.
I guess he means these Facebook accounts probably aren't controlled by the represented human beings.
It is possible that somebody knew some of these people for a certain extent and had a reason to mock them.
May be a true blood troll read the story ~10 years ago and it popped up in his mind when he brainstormed in the pedophile topic. Or somebody who got kicked out of the group.
Why would anybody communicate on Facebook like this?
If you regularly use Facebook anyway, then sure, you might also try to use it for some "encrypted" messaging because you got used to it and it passes as "noise".
But to use it only for sending messages which should never become public...?
Facebook let's you set who sees your posts and who does not. why not use that for these kind of messages? (Letting alone the truly secure channels...)