Instagram received a fair amount of press over the last week. First, 10 days ago, the app launched on Android. Then news of Facebook buying the tiny startup for $1 billion was everywhere from the Drudge Report to The Daily Show. The attention resulted in explosive growth. Since the launch of its Android app, Instagram’s user base grew from 30 to 40 million. That’s over 1,000,000 new users a day.
Rakshith, the creator of gramfeed, pinged us this morning after noticing the milestone from Instagram’s API. The 40 millionth user is valentinoelbuti. It seems at the time of this post’s writing, Instagram has exactly 40,026,379 users — or rather, roughly 5% of Facebook’s active user base.
It took Facebook four years to hit 100 million users. Instagram is on track to beat that number. The photo sharing service launched in October 2010 and saw 1 million users…
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