-Facebook was founded on February 4, 2004 and is headquartered in Menlo Park, California. Facebook Messenger was released for Windows on March 6, 2012. Mark Zuckerberg, the main founder. Facebook is the world's leading photo-sharing site, uploading about 350 million photos per day as of November 2013. As of May 2012, Facebook had about 900 million users. Facebook has its headquarters in Menlo Park, Silicon Valley -- 1 Hacker Way. As of September 11, 2006, anyone can join by entering a valid email address and their age group. Facebook has been blocked in China since 2009 for social and political reasons, but the company has also been in constant contact with the Chinese tech community, hoping to gain access to the Chinese government by, among other things, investing in Chinese tech companies. On March 17, 2018, it was revealed that Cambridge Analytica "stole" the information of 50 million Facebook users. On September 28, 2018, Facebook said it had been hacked, affecting nearly 50 million users. 50 million Facebook users are threatened with a $1.63 billion fine from the European Union over the leak . On July 2, 2019, Germany fined Facebook 2 million euros. In July 2019, fortune Global 500 2019 was released: Ranked 184th. In October 2019, Interbrand ranked 14th in the Top 100 Global Brands list. On October 23, 2019, The 2019 Fortune Future 50 list was released, and Facebook ranked 49th. On November 12, 2019, Facebook announced the launch of Facebook Pay, a mobile payment service. June 2021, according to market sources: Facebook is being investigated by eu, UK antitrust authorities. On October 28, 2021, Mark Zuckerberg announced that Facebook would change its name to "Meta."