Pica, I hear great things about Ravelry. As for Facebook, I’m co-admin of three pages and really need to start a fourth, for Festival of the Trees. It becomes kind of mandatory after a while if you’re concerned about getting a message out. I do kind of resent that, especially when I go to all the trouble to create an online space for conversation, such as the videopoetry discussion blog attached to Movng Poems, and it doesn’t get used much because people would rather stay on Facebook. (We’re lucky with qarrtsiluni, though: what comments come in do tend to be almost invariably on the website.)