I'm an active member on 4 different message boards. This one (for my music discussion), Pearl Drummer's Forum (for drum discussion), New York Sports Day Forums (for NY sports discussion), and GameFAQS message boards (for video game and sports dicussions).
It's really amazing. I can't imagine how much more life would suck if I had only my peers to talk to about music. Most of the kids in my school think that Led Zeppelin was a single person that was alive in the 40s and wrote some song about a staircase.