Mark Zuckerberg Mark Zuckerberg

This thumbs up or "like" icon at the Facebook main campus in Menlo Park, Calif., may soon have a neighbor. Founder Mark Zuckerberg said Tuesday that the social network soon would test a long-requested "dislike" type of button. Robyn Beck/AFP/Getty Images hide caption

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Robyn Beck/AFP/Getty Images

Facebook CEO Mark Zuckerberg emphasized his company's mobile-centered future Tuesday, in his first public comments since Facebook's troubled IPO. Eric Risberg/AP hide caption

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Eric Risberg/AP

President Obama joins in a toast with Technology Business Leaders at a dinner in Woodside, California, Feb. 17, 2011. Apple's Steve Jobs is to the president's left. Facebook's Mark Zuckerberg is to the president's right. Pete Souza/The White House hide caption

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Pete Souza/The White House

Zuckerberg unveiled the privacy changes on Wednesday. Gabriel Bouys /AFP/Getty Images hide caption

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Gabriel Bouys /AFP/Getty Images

Zuckerberg: Sharing Is What Facebook Is About

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