Facebook is testing its beta mobile ad network for a second time, this time trying to demonstrate that it can target users with more relevant ads. Facebook first tested the effort, as a layer atop existing systems, in September 2012, and stopped after three months. "[O]ne reason for the pause may have been low margins. Facebook needed to channel its energy into clear money makers like its mobile app install ads and Facebook Exchange," Catherine Shu writes.
Facebook launches second test of mobile ad network, vowing better targeting
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