I don't know if other people suffer the angst of overchoice and hard decisions about the social media services they will use. There are so many tempting choices, from Posterous, to Buzz, to Twitter, to (of course) Facebook - not to mention the more esoteric ones that I continue to try. The best services are certainly not the most popular ones. Jaiku and identi.ca are more useful than Twitter, for example. Friendfeed is (was) superior in many ways to Facebook.
But despite all, it's somehow necessary to minimize, and the value of these services is reduced by the lack of participation of friends - so all but those with a large following would move to less popular services. Still, I find it hard to make my mind up.