Facebook, LinkedIn, Twitter, YouTube, and Zynga Put Their Social Heads Together For Good [Video]

Fast Company's Farhad Manjoo hosted a chat with Facebook's Nick Grudin, LinkedIn's Meg Garlinghouse, Twitter's Biz Stone, YouTube's Hunter Walk, and Zynga's Ken Weber. For the first time, they discussed the power of "slacktivism," the viral mind-set, and philanthropy as the future of marketing.