Only 83 million Facebook accounts are fake? That number seems kinda low doesn't it? For what it is worth, these are numbers provided by Facebook so add a grain of salt as needed. 
Last week, during its first quarterly earnings report as a public company, Facebook revealed it had 955 million monthly active users and 543 million monthly active mobile users. In the social-networking giant's 10-Q filing published last night, the company disclosed that nearly 20 percent of the latter number, 102 million users, accessed the social network in June solely from their mobile device.