What is a patch in your case? Are you running a sliding window over the image or tiling it? Then are you marking each pixel as belonging to the edge of a document or are you marking detected edges as valid document boundaries? Also how do you model the links between the 4 sides? A reference to a paper or follow up blog post would be greatly appreciated.
I like it too, zen, especially the female voice.
Would be neat to add special effects in the audio stream, e.g. if the tweet is about "happy hour" or "party", or if it's news you could have background clip like CNN.com headlines