The highlight of my long weekend at South by Southwest Interactive was the lunchtime panel and mixer hosted by Tikva Morowati of Porter Novelli and Jeff Pulver at Stubb’s — Social Media for the Social Good.

(l-r) Jeff Pulver, Beth Kanter, Stacey Monk, David Armano, Randi Zuckerberg, James Young, Scott Goodstein,Tikva Morowati
Many more recent studies and examples of this including this pdf white paper. Geoff Livingston is even teaching a class on Social Media for Social Good at Georgetown this semester.
Below, the rough takeaway — er, walkaway by myself and Shira Lazar: