WTF is a Rifftlet?

That's what went through my mind when I found rifflet.com. It's an new website that calls itself the "home for unfinished songs". he idea is that it's like Twitter, except for music. Users upload snippets of their own work, for the sole purpose for it to be used in collaboration with others. So, what is a rifflet? It's what ever you want it to be. I personally think that it's a novel idea.