Facebook CEO Mark Zuckerberg speaks at Facebook headquarters in Menlo Park, Calif., Thursday, March 7, 2013. Zuckerberg on Thursday unveiled a new look for the social network's News Feed, the place where its 1 billion users congregate to see what's happening with their friends, family and favorite businesses. (AP Photo/Jeff Chiu)

Facebook CEO Mark Zuckerberg speaks at Facebook headquarters in Menlo Park, Calif., Thursday, March 7, 2013. Zuckerberg on Thursday unveiled a new look for the social network's News Feed, the place where its 1 billion users congregate to see what's happening with their friends, family and favorite businesses.(AP Photo/Jeff Chiu)

Facebook CEO Mark Zuckerberg speaks at Facebook headquarters in Menlo Park, Calif., Thursday, March 7, 2013. Zuckerberg on Thursday unveiled a new look for the social network's News Feed, the place where its 1 billion users congregate to see what's happening with their friends, family and favorite businesses.(AP Photo/Jeff Chiu)

Facebook CEO Mark Zuckerberg speaks at Facebook headquarters in Menlo Park, Calif., Thursday, March 7, 2013. Zuckerberg on Thursday unveiled a new look for the social network's News Feed, the place where its 1 billion users congregate to see what's happening with their friends, family and favorite businesses.(AP Photo/Jeff Chiu)

Facebook CEO Mark Zuckerberg speaks at Facebook headquarters in Menlo Park, Calif., Thursday, March 7, 2013. Zuckerberg on Thursday unveiled a new look for the social network's News Feed, the place where its 1 billion users congregate to see what's happening with their friends, family and favorite businesses.(AP Photo/Jeff Chiu)

Facebook CEO Mark Zuckerberg speaks at Facebook headquarters in Menlo Park, Calif., Thursday, March 7, 2013. Zuckerberg on Thursday unveiled a new look for the social network's News Feed, the place where its 1 billion users congregate to see what's happening with their friends, family and favorite businesses.(AP Photo/Jeff Chiu)