http://twitter.com/
http://www.ning.com/
http://www.facebook.com/
http://www.plurk.com/
http://www.linkedin.com/
https://wave.google.com/wave/
http://foursquare.com/
http://thetwitcleaner.com/
http://www.tweetdeck.com/
http://seesmic.com/
http://edchat.pbworks.com/
http://live.classroom20.com/
http://www.google.com/reader/view/