This is a great start up story which takes about 18 months and ends as many know with Facebook buying Instagram for $1 billion in cash and stock.
Many Instagram users who want to make a statement about their “hatred” of Facebook have left the service. While I’m no fan of Facebook and don’t use it I still use and enjoy Instagram. I plan to keep using Instagram until they require a Facebook login or mess it up with more Facebook integration. It remains an excellent tool for posting images to Twitter and flickr and if you use Facebook, that service too.