Read the article: History of Facebook In Photos by Mark Weinberger
The company announced 500 million users in July 2010] and according to its data, half of the site's membership used Facebook daily, for an average of 34 minutes, while 150 million users accessed the site by mobile. A company representative called the milestone a "quiet revolution." 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.