On September 26, 2006, Facebook opened to everyone at least 13 years old with a valid email address.[34][35][36] By late 2007, Facebook had 100,000 pages on which companies promoted themselves.[37] Organization pages began rolling out in May 2009.[38] On October 24, 2007, Microsoft announced that it had purchased a 1.6% share of Facebook for $240 million, giving Facebook a total implied value of around $15 billion. Microsoft's purchase included rights to place international advertisements.[39][40]
In October 2008, Facebook announced that its international headquarters would locate in Dublin, Ireland.[41] In September 2009, Facebook said that it had achieved positive cash flow for the first time.[42] A January 2009 Compete.com study ranked Facebook the most used social networking service by worldwide monthly active users.[43]
The company announced 500 million users in July 2010.[44] Half of the site's membership used Facebook daily, for an average of 34 minutes, while 150 million users accessed the site from mobile devices. A company representative called the milestone a "quiet revolution."[45] In November 2010, based on SecondMarket Inc. (an exchange for privately held companies' shares), Facebook's value was $41 billion. The company had slightly surpassed eBay to become the third largest American web company after Google and Amazon.com.[46][47]
On November 15, 2010, Facebook announced it had acquired the domain name
fb.com from the American Farm Bureau Federation for an undisclosed amount. On January 11, 2011, the Farm Bureau disclosed $8.5 million in "domain sales income", making the acquisition of FB.com one of the ten highest domain sales in history.[48]
In February 2011, Facebook announced plans to move its headquarters to the former Sun Microsystems campus in Menlo Park, California.[49][50] In March 2011, it was reported that Facebook was removing about 20,000 profiles daily for violations such as spam, graphic content and underage use, as part of its efforts to boost cyber security.[51] Statistics showed that Facebook reached one trillion page views in the month of June 2011, making it the most visited website tracked by DoubleClick.[52][53] According to a Nielsen study, Facebook had in 2011 become the second-most accessed website in the U.S. behind Google