Initially, Facebook was available only to Harvard students, then to other Ivy League institutions, companies like Apple and Microsoft and as of September 26, 2006, everyone in the world who has a valid email address and is at least 13 years old.
As of last month, the social network has over one billion active users worldwide. California-based web analytics company Quantcast reports that in May 2011, it had 138.9 million monthly unique visitors in the U.S.; that’s close to 45 percent of the country’s population.
A billion users, half of them accessing the social media through their mobile devices, which means that they can be reached at all times: it’s a marketing team's wettest dream.
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