Months ago (08.06) I posted a call for examples of "social network philanthropy" - something along the lines of SocialPicks.
Here's what I've found - please send yours:
59 Smartest Organizations list is worth looking at including their criteria
Avatar Action - which is a website and 2L world connected
Missionfish - which powers eBay giving
And there was Omidyar.net's collaborative funding project
I'll keep thinking...Please send me yours