Internet And Technology Leaders Address Web 2.0 Summit 2011
SAN FRANCISCO, CA - OCTOBER 18: Foursquare co-founder Dennis Crowley speaks during the 2011 Web 2.0 Summit on October 18, 2011 in San Francisco, California. The 2011 Web 2.0 Summit features keynote addresses by Internet and Technology leaders and runs through Wednesday. (Photo by Justin Sullivan/Getty Images)
18 Oct 2011
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