The only thing I can think is that you get a comments section free, but surely that can't be all? Do they give you some analytics? Or can you make money by having ads on your page?
@loke @SDF No money. FB page was started years ago and we only post info there that can be found just as easily on our own page: nycbug.org and through twitter/bsd.network. Just a tool for getting the word out, and hardly our primary one. BSDNow also has added us to their BSD Bits segment. If you run a *BUG, I HIGHLY recommend getting in contact with them. Be well.
functional.cafe is an instance for people interested in functional programming and languages.