Thanks Mark Jovana also pointed that out. I think it used to be 100 - but maybe I'm just mis-remembering.

Yep, the spreading of interaction is a real issue. We (GuitarForum.co.za) almost didn't start a Facebook page because of this but, despite the spreading of interaction, we've found Facebook to be an invaluable tool for growing our forum subscriber base. So the odd guy posts on FB, no biggie. I think they sooner or later realise that the actual forum is where the action's at, and then we gain a member