Change.org uses social networking to help social causes. For the launch, they’ve already partnered with 50 non-profits, like CARE, Greenpeace, and Amnesty International. Any other non-profit can launch their own network as well, as long as you have a government approved tax ID number.
They have modules for all an organization’s main needs: events, fund raising, forums, blogs, members, and posting photos/video. I really like how Change.org is evolving overall. The site is about connecting people passionate about a particular cause and not engaging in a shouting match or symbolic gestures of online support.