Facebook's updated S-1 was peppered with juicy details, especially concerning the $1 billion acquisition of Instagram. According to the filing, Facebook acquired the photo sharing app for 23 million shares of common stock and $300 million in cash. As of January 31, 2012, Facebook valued its shares at $30.89 per share. Accel Partners is Facebook's biggest VC backer, and the firm holds claim to a minority share of about 11%.
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