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

itoggle caption 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

itoggle caption Pete Souza/The White House