I'm there only because I have to be. Facebook too. For the most part I simply auto-feed my ATV blog to twitter and once in a while I'll socialize on it. It's nice to skim through to find news for my industry, but that's about it.
I've connected with two FMX teams so far. Interviewed one guy, Scotty Stephens (newest Metal Mulisha Freestyle Motocross member), and published the interview already.
On Nov 8th I'm going to another interview/photo shoot in Murietta. This time the team's models will be there, and they're saying I'll be able to get a ride in a helicopter to get some shots. Not sure how that's gonna work out.
I'm making money from it, but much of the info garnered from there is useless except when people publish current activities that I can get to while they're still going on.