Instagram : more than 5 million users and 100 million image

As we all know Instagram app is one of the top images sharing and adding effects. This app also have a lot of iPhone users, the have reached 100,000,000 user in the latest statistics of the service.
More than 890 thousand, and it just increased to reach 100,000,000 image. It's really a huge success for this service, because the low number of the people who works on it and develop it ( only 4 people are working on it ), but still it's the best uploading app I've ever used.
I think the number of this service will keep increasing in a huge amount if it was available for Android phone. What do you think ?