Yesterday Instagram was acquired for $1 billion. Another huge milestone for the company is that they have hit 5 million Android users in 6 days. That is almost one million new users per day. This adds on to the 30 million users that have Instagram on iOS. This gives Instagram the credibility of having the biggest Android app launches of all time. It took Instagram six months to hit 5 million users on iOS and only 6 days on Android.