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instagram 400 millionInstagram announced today that more than 400 million people have signed up for the photo-sharing social network, double the number that were on the platform as of March 2014.

Instagram has seen a lot of change lately. In the three years after the company was bought by Facebook for $1 billion, Instagram has debuted companion apps, got rid of it’s trademark square-photo requirement and, most importantly, added ads to users feeds.

The new user growth shows that Instagram isn’t slowing down either. It added 100 million users in the last nine months, and added another 100 million in the nine months before that. Of the last 100 million to join, more than half are from Europe and Asia, showing the importance of the emerging markets.

The number of Instagram users surpassed Twitter users back in December, and the gap is growing quickly. Twitter had just 316 million users at the end of the second quarter, falling to 15 percent year over year user growth. Facebook, on the other hand, has seen steady traffic growth and  last month had more than 1 billion users using the site on a single day, more than two-thirds of the 1.44 billion people using the site.

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