Joe Kraus, is a serial entrepreneur who has built two financially successful startups in 13 years - first the Internet portal, Excite, and then the Web 2.0 company JotSpot, which develops software for online collaboration. After Google acquired JotSpot in 2006, execs tapped Kraus, 36, to lead OpenSocial, a set of standards for social networking sites. He modeled the team after - what else? - a Silicon Valley startup. "Truthfully speaking, it all feels very entrepreneurial," he says. "One day you go home feeling things are going terribly. The next day, things are awesome. And nothing has actually changed."
Last updated January 22 2008: 8:01 AM ET