[thoth]

I just remembered another thing Facebook lets you do that Meetup doesn't: have a virtual group.

All Meetup groups have to be face-to-face group with the intention of physically meeting, so if you want to organize your online play-by-email board games or whatever, or other groups that don't actually intend to meet very often (e.g. class alumni groups mostly for the purpose of distributing info), you can't have either of those be a Meetup group.

But Facebook doesn't care if you do that.