SAN FRANCISCO, CA - OCTOBER 17: Twitter CEO Dick Costolo speaks during the 2011 Web 2.0 Summit on October 17, 2011 in San Francisco, California. The 2011 Web 2.0 Summit features keynote addresses by ... more 
SAN FRANCISCO, CA - OCTOBER 17: Twitter CEO Dick Costolo speaks during the 2011 Web 2.0 Summit on October 17, 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) less 
1 / 23
Getty Images | Photo By Justin Sullivan / Getty Images
Tue, Oct 18, 2011 12:15 AM EDT