Mark Zuckerberg, Hans Vestberg, Dongjin Koh, Shang Bing at Mobile World Congress

February 24, 2016 11:31 IST 1 of 6
Mark Zuckerberg (L), founder of Facebook, is greeted by Samsung's Mobile Communications Business president, Dongjin Koh, during the unveiling ceremony of the Samsung S7 and S7 edge smartphones at the Mobile World Congress in Barcelona, Spain on 21 February 2016. Credit: Reuters