Instagram Captures 100,000 Mobile Photo Addicts In Less Than A Week

Instagram has had a good week. Seven days ago, after months of testing , they released their first app into Apple's App Store. Within a few days, my feeds on Twitter, Tumblr, and Facebook were inundated with Instagram images. I'm friends with a lot of early-adopter types, so I wondered if it just seemed like the app was everywhere. But it turns out it's not just my friends using it, it's their friends and their friend and their friends... Last night, just six days in existence, the service crossed 100,000 users. Now, 100,000 may not seem that impressive in a world where Facebook has 500 million users, but again, that's after just one week in existence and only being available on the iPhone. You can't even sign up on their website yet, you need to get the app to be a user. As a point of comparison, it took new media darling Foursquare seven months to get 60,000 users.