Sree Sreenivasan (@sree) is both a tech evangelist and skeptic. He's a professor at Columbia Journalism School, where he teaches digital media and entrepreneurship. A former TV technology reporter on WABC and WNBC, he is a contributing editor at DNAinfo.com, a Manhattan-news startup he helped launch with Joe Ricketts (founder of Ameritrade). Sree was named one of AdAge's 25 media people to follow and one of Poynter.org's 35 most influential people in social media.