Show HN: A Facebook profile picture guessing game I made
Check it out: http://friendblur.com/
This was my first Backbone.js app, as well. It seems to work pretty good on IE, FF, Chrome and Safari. I used Bootstrap to quickly get it out there. There's no server side database or anything, yet. I don't keep track of scores or anything. The only thing the server does is pipe facebook image data back to the user, because that was the first idea I had as to how to get around a cross-domain issue with blur.js.
So, if anyone knows how to get image data somehow from the browser cache or something, that'd save me some bandwidth. :)