Startup Idea : Pissederest: Pinterest for when you're pissed off

For our non-American Ideators, pissed off = angry. We already have several other Pinterest mashups, like Pinstagram (Pinterest X Instragram). What about a Pinterest-clone - just for pinning what pisses you off, like the guy who takes two parking spaces because he is too lazy to park well, or the on-sale item that you wanted for which there are none left on the store's shelf.