I started on Facebook last summer, but didn't really start using it until a month ago. I only have 29 friends, but I know each and every one of them I tend to limit my status updates to something related to cycling or a little humor, generally only a few times/week.

I also use FB to keep up with certain organizations and groups that I am interested in, though I rarely post there. I DID find the Surly Long Haul Trucker group, which is nice.