Yahoo.com: Obama hosts Xi at White House for superpower summit

AFP: "Officials hope that by starting with a casual meeting the leaders of the world's two pre-eminent military and economic powers will find time for a less staid exchange of views." 

New York Times: A Chat in Chinese with Mark Zuckerberg, as Tech Giants Jostle for Face Time

Mr. Zuckerberg of Facebook spoke with the president in Mandarin for what seemed like at least a minute when Mr. Xi greeted him.