Robotic abuse has a tendency to bring cool projects like this to their knees. Any publicly-accessible, readable/writable service will eventually run into this problem.

Tell me about it, I looked shortly after we launched Pastery and saw 100,000 pastes and was ecstatic at the response, but then noticed that some were spam. I deleted all the ones that had spammy terms, and was left with 53 pastes :(