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Facebook's breathlessly anticipated IPO filing has arrived. Facebook filed documents with the Securities and Exchange Commission saying they'd like to sell shares to the public, and the documents will include a lot of info about the company which business and tech reporters are busily sifting through as we speak. News leaked Tuesday that Facebook would only file for a $5 billion IPO instead of the expected $10 billion in order to perhaps jack up the share price.

Update: Already (in case you needed confirmation) we're learning specifics about just how well Facebook is doing. Revenue in 2011 $3.711 billion, up 88 percent from 2010. Farmville addicts will be interested to know that Zynga, the social game maker, accounted for about 12 percent of Facebook's revenue in 2011. Also, slightly more than half of the 845 million active Facebookers visit the site every day (Guilty!) 

Update: The filing comes with an interesting letter from Mark Zuckerberg, who writes about Facebook's pretty big vision for the future (and its role there.) He says, in part:

By helping people form these connections, we hope to rewire the way people spread and consume information. We think the world’s information infrastructure should resemble the social graph — a network built from the bottom up or peer-to-peer, rather than the monolithic, top-down structure that has existed to date. We also believe that giving people control over what they share is a fundamental principle of this rewiring.

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