Google remains the most-visited mobile site, according to a ComScore mobile-media ranking, but smartphone users spent more total time on Facebook, amounting to 12% of their time on their phone. That bodes well for the social network's efforts to develop the mobile-ad space, Kunur Patel writes. "If Facebook's recent internet past is any bellwether, mobile may represent the next major boost to its ad revenue," Patel writes.

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