OMG, I would LOVE to do Treehouse Reversebang for hockey RPF! And, um, most of my hockey fandom interaction comes on Twitter - I just basically followed a couple of people, then followed the people they were talking to, and so on and so on and so on.

There are also a couple of LJ communities; I see a lot of people asking about DW communities, but I don't know if there is one. And Tumblr? But honestly, for me it's just Twitter right now, because I don't have time for Tumblr.