As the former VP of Marketing at Zimride, a Silicon Valley startup building trusted networks for carpooling, Tessa Petrich understands how to galvanize people into action. Using Facebook, Twitter, email and even frog costumes for on-site events, Petrich built large carpool communities at 40+ college and corporate campuses. For more about Zimride’s success read here http://www.zimride.com/about or here http://www.nytimes.com/gwire/2009/07/29/29greenwire-startup-bets-that-social-networking-will-spur-36381.html