October Net Tuesday SF (10/14) will explore Alternate Reality Game (ARG) Superstruct, a project of the nonprofit Institute For The Future with Jane McGonigal. Join Us!
Quite a few non-profit organizations have set up a presence, primarily via groups, on Facebook. This is because the platform is very friendly to the development, deployment, and utilization of applications and integration that help an NPO to work more effectively on its'objectives.
Look at the early accomplishments on the Facebook platform by NTEN, "Non-Profits on Facebook", and TED to see a few good examples in their early going.