Spacebook (NASA), Open Government Initiative, White house

"Additional Details: Spacebook was launched in June 2009 and now has over 850 users across NASA."

Keith's note: For an agency that has tens of thousands of employees inside the firewall, you (at least) need a zero on this number in order to call it a success - especially when you consider what these employees (and their kids) use out in the real world. Then again, it is a good start. I can clearly recall what it took back in the 80's for my supervisors at NASA to start using email - personally (instead of having their secretaries check it once a week).