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
Kowloon-Canton Railway Corporation the chairman) and the executives (led by the CEO) to suit its operational needs and the prevailing corporate practices which change over time. This deliberate lack of clarity arguably sowed the seed for a future controversy. Michael Tien, a businessman, was subsequently appointed as the chairman, with the former chairman and chief executive, K Y Yeung, stepping down to become the CEO. It rapidly became publicly evident, however, that there was personal tension between the two, exemplified by Michael Tien's denial that he was a good friend of K Y Yeung when the two briefed the media in 2002 on