Instagram is the mobile social network that is known for having retro-style photo filters. Since this past Christmas, Instagram has gained over 10 million users. This makes Instagram the largest mobile-only social network with a global reach. Foursquare has about 22 million users. LiesDamnedLiesStatistics.com was able to find out this information by looking at two web viewers that use Instagram’s API.
Instagram’s newest users have an ID associated with them that are higher than 25,000,000. There is no ID associated with #1 or #2, but #3 happens to be Kevin Systrom, Instagram’s co-founder. Right before Christmas, Systrom told NPR that Instagram had 16 million users. Instagram currently only has apps for the iPad, iPhone, and iPod Touch. They are reportedly working on Instagram for Android.