I was confused as to what it did, until I pressed 'I'm feeling sucky' and got 'Jutin Beiber sucks more than Socks' and the related tweets.<p>I suggest you start the page preloaded with an example like this which is curious and brings a laugh and which has then initiated many tweets you can also show. Maybe even just pre-run the 'I'm feeling sucky' once.<p>This way it's very clear from the outset what to do as this discover process is currently painful.
That voice totally does it! The thing is really easy to put together in 5 minutes, but text-to-speech is a neat feature that other similar sites don't have.