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F8: Watch Mark Zuckerberg's keynote live

Facebook CEO Mark Zuckerberg is widely expected to reveal more details about plans for a mobile ad network at the company's F8 developer conference in San Francisco on Wednesday.

Such a service would let Facebook further monetize the data collected on its 1.28 billion monthly active users by enabling advertisers to provide highly targeted ads using that data on other mobile platforms, including apps and games.

Read MoreZuckerberg talks up ad network