Via Kristen Nicole's post, YourCause: Connect with Others to Make a Difference on Mashable:

"YourCause is a network for connecting users with non-profit organizations and others looking to make a positive difference. It does so by creating a community where users can choose a cause and promote it by creating their own dedicated Web page for it. It's up to the individual users to help promote their personal dedication to a particular cause, which is connected to the charity itself via YourCause."

Anybody given it a spin yet?

 nptech net2 nonprofit social network