Neat. Your challenge here will be finding a large enough community of people who want to put the time and effort into illustrating and animating this – enough to create a stream of new content for users.

Instagram caught on in part because taking a photo is so easy. None of the composition involved in writing even a 140-character tweet: you just hold up the camera and snap. (Yes, photography involves composition, but pretty filters aid even the worst photographers there.) Do you have any idea of how you'll encourage enough content to create a meaningful feed?