Instagram update adds three more filters, two new, one old

Instagram, the wildly popular social photo sharing app for iOS, has just been updated to add two brand new filters to its armory: 'Walden' and 'Hefe.' Also back by popular demand is 'Poprocket,' which got turfed out with the last update, much to the dismay of many Instagram users.

Given that Instagram isn't the only player in the iPhone photo-sharing space, rapid innovation seems key to the fledgling service's success. Surely the next step is to expand beyond iOS to all the budding Android, webOS, BlackBerry, and WP7 photographers -- why should they be left out of the fun?

Tags: apps, Instagram, iOS, iPhone, photography, social networking, SocialNetworking