On 1st Day it hits 1 Million and now its 5 Million on 6th Day, so now its cool. The massive popularity of the app led the Facebook gobbling it up for $1 billion. Android might soon surpass its popularity on iOS. At 5 million for six days, Instagram has kept a steady growth of nearly 1 million downloads per day. when it opened pre-registration for its Android variant on March 24, it attracted 430,000 pre-registration signups in the following days. Are you using the Instragram on Android and how do you like it? Share your opinions below.