Larry Page using Android software and, by 2010, 17.2% of the handset market consisted of Android sales, overtaking Apple for the first time. Android became the world's most popular mobile operating system shortly afterward. Following a January 2011 announcement, Page officially became the chief executive of Google on April 4, 2011, while Schmidt stepped down to become executive chairman. By this time, Google had over $180 billion market capitalization and more than 24,000 employees. After Schmidt announced the end of his tenure as CEO on January 20, 2011, he jokingly tweeted on Twitter: "Adult-supervision no longer needed." Quartz organizational management reporter, Max
Joel Klein Cathie Black, chairman of Hearst Magazines and former president of "USA Today", on January 3, 2011. On July 6, 2011, Rupert Murdoch, chairman of the News Corporation and the company's CEO, announced that Joel Klein would "provide important oversight and guidance" in the internal investigation of phone hacking at "News of the World". Klein took over the investigation, with fellow director Viet D. Dinh, from News International UK Chief Executive, Rebekah Brooks, whose own involvement in the phone hacking scandal made her unable to continue as an impartial investigator. Since joining News Corp, Klein has recruited at least two other