Oh, RSS Is Definitely Dead Now: Feedburner CEO Dick Costolo To Become Twitter COO Former Google exec and the cofounder/CEO of RSS service Feedburner Dick Costolo is Twitter’s new chief operating officer, we’ve heard from multiple sources. Costolo, who sold Feedburner to Google for $100 million in 2007, left Google in July. We’d heard he was looking to start a new company, but obviously Twitter swo