I don't mind the facebook groups too much.
I think my biggest issue is that there's just so many of them! How does someone know which are good and bad? Checking them all is just a huge waste of time and the sheer multitude makes it easy for scammers and poachers to just move to a new group.
Forums are nice because, as nim mentioned, they're conducive to long-term discussions as well as do a better job at consolidating interest...IMO anyways