when was facebook first opened to the public
History of Facebook On October 1, 2005, Facebook expanded to twenty-one universities in the United Kingdom and others around the world. Facebook launched a high school version in September 2005, which Zuckerberg called the next logical step.[40] At that time, high school networks required an invitation to join.[41] Facebook later expanded membership eligibility to employees of several companies, including Apple Inc. and Microsoft.[42] On December 11, 2005, universities in Australia and New Zealand were added to the Facebook network, bringing its size to 2,000+ colleges and 25,000 + high schools throughout the United States, Canada, Mexico, the United Kingdom, Australia, New Zealand, and Ireland. Facebook was then opened on September 26, 2006 to everyone aged 13 and older with a valid e-mail address.[6][7]
WhatsApp The client was created by WhatsApp Inc., based in Mountain View, California, which was acquired by Facebook in February 2014 for approximately US$19.3 billion.[47][48] By February 2018, WhatsApp had a user base of over one and a half billion,[49][38] making it the most popular messaging application at the time.[38][50] WhatsApp has grown in multiple countries, including Brazil, India, and large parts of Europe.[38]