Twitter reported some strong numbers to Wall Street yesterday. The social network now has 255 million monthly active users, 198 million of which are also active mobile users. The company also shared that it generated $250 million in revenues, the vast majority of that coming from mobile ads. But one stat, illustrated in the chart below, hints at possible trouble ahead for Twitter, and sent its stock tumbling. Twitter's growth is slowing: via Business Insider Related articles Top Analyst Reviews Spotify's Financials, Declares Business "Unsustainable" [CHART] 68% Of Facebook Users Are Mobile [CHART] Twitter beats estimates but shares slammed on...

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