Power.com: For Social Networking Power Users
http://www.techcrunch.com/2008/11/30/powercom-for-social-networking-power-users/

Chances are you use at least two major social networks - 49 million people, for example, visited both MySpace and Facebook in October 2008 (Comscore, worldwide). Nearly 7 million people in the UK use both Bebo and Facebook. A lot of people maintain very different friend lists on LinkedIn than MySpace or Facebook. Etc. And when you add in niche social sites like YouTube, Flickr, etc., there’s even more overlap among users.

Chances are you use at least two major social networks - 49 million people, for example, visited both MySpace and Facebook in October ...