Facebook has just filed a fourth amendment to its S-1 to IPO that notes that it now has 500 million mobile users, 901 million monthly active users, and that it paid 23 million shares at $30.89 a share plus $300 million cash for Instagram for a total of $1,010,470,000. Facebook also made $1.058 billion in revenue in the first quarter of 2012, up 44.7% from Q1 2012 but down 6.5% from Q4 2011.

So if Facebook maintains its current revenue rate, it would make between $4.69 and $4.81 on each of its 901 million users each year. Read on for more on Facebook’s business, user counts, photos, apps, employees, Instagram, and to see our embed of the full amended S-1.

Of the total $1.058 billion in Q1 2012 revenue, Facebook had an operating income of $381 million, and net income of $205 million. Advertising made up $872 million of…

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