A Facebook source disputed a widely quoted report that showed the social network was losing active users in the U.S. Facebook is still cool, it swears!

Facebook added U.S. users in May, an anonymous company source told Business Insider. That contradicts a report from Inside Facebook suggesting the social network lost 5 million active users. It turns out that traffic from mobile devices, which was excluded from the Inside Facebook report, is responsible for the difference. Mobile traffic also explains fresh numbers from Comscore and Nielsen that also show Facebook gained unique U.S. visitors in May.

Of course, no one disputes that Facebook is adding users more slowly as it matures and saturates its original markets. That slowdown means that in order to keep growing traffic the company needs to get existing users clicking more. It's going to try awfully hard to do so; try not to get sucked in too deep.

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