You would probably have to be living under a rock not to have heard about Instragram now being available for Android devices. Also in the news a lot recently was how facebook bought Instagram for one billion dollars.
Obviously, so much press has made it something that people want even if they may not know why. A friend told me that there was a bogus version being downloaded by a lot of people, and as a result, one of the recommendations being suggested was to be sure you only download from the Google Market.
