Twitter generates 65% of its advertising revenue through mobile ads, according to a regulatory filing preceding its initial public offering that indicates the social network is seeking to raise $1 billion. Twitter averaged 218 million monthly active users in the second quarter, a 44% increase from the year before, and it posted first-half 2013 revenues of $253.6 million, the filing says. Despite that growth, Twitter has yet to turn a profit, according to the filing.

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