Relating to my previous post, we might be able to get image organization by picture on a wide scale if Pinterest allowed emoji as category names and search terms.
There would be a large group of people who would use the emoji simply to identify other use of the emoji in the images. Eventually some people would use the emoji for categorization though and use the smiley emoji to tag things that made them happy and so on.
They don't seem to allow punctuation in the search right now so I can't find examples of people trying to do this themselves with the emoticons/ASCII art.