Instagram Is Already Bigger Than Twitter On Smartphones

This week, Mark Zuckerberg dropped the tidbit that Instagram has more than 200 million users, double the user base it had when Facebook acquired the photo-sharing service two years ago.

With 241 monthly active users worldwide, Twitter still enjoys a modest lead. But in the U.S., on smartphones — the medium through which both services were built to be experienced — Instagram seems to be pulling ahead.

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