The long-awaited Android version of Instagram's popular iOS app was a success from the beginning (an "instasuccess," if you must). Within the first 24 hours after the app launched last Wednesday, it had more than 1 million users. While the app's momentum has slowed slightly, it continues to be downloaded at an impressive pace.
Instagram for Android is currently the third most popular free app on Google Play and the most popular app that isn't made by Google.
The startup's iOS app launched in October 2010. It took seven months for that version to reach 4 million downloads, according to Bloomberg. The app has now been downloaded more than 30 million times.
Instagram's Android momentum likely helped set the startup's impressive $1 billion price tag. In addition to acquiring a huge presence on Apple devices and a location tagging system people actually use, Facebook now has one of the most successfully launched apps on Google's operating system sitting in its portfolio.