U.S. President Barack Obama looks up during a meeting with executives from leading tech companies at the White House in Washington December 17, 2013. Pictured are (L-R): Zynga co-founder Mark Pincus, Yahoo CEO Marissa Mayer, Obama, AT&amp;T Chairman and CEO Randall Stephenson and Facebook COO Sheryl Sandberg. 

REUTERS/Kevin Lamarque