In a new report that will make painful reading for those at Twitter, E-Marketer claims that Instagram, the Facebook-owned photo app, now has more smartphone-based users in the US than Twitter.

According to the figures — reported by the Financial Times — Instagram has 35 million US mobile users, while Twitter has 30.8 million. More generally, Twitter claims 240 million active users worldwide each month — across both desktop and mobile devices — which keeps it ahead of Instagram, which counts 200 million, for now at least.

The research comes at an interesting time for Twitter. The company is pushing its multimedia credentials after it added multiple photo uploads and image tagging to its mobile app, a change that has received a mixed reaction from users.

➤ Instagram passes Twitter in race for US smartphone users [Financial Times]

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