ASk HN: Handy domain blacklists to preload a new site with?

About to launch a major update to our anonymous network, socialface.com, and we'll be adding a /news style system to the works.

Being a single dev and enjoying daily periods of sleep, I'm looking to minimize the spammers as quickly as possible and was hoping to preload a couple thousand blacklisted domains or so.

I'm not looking for email spammers, or bad IPs specifically, but a list of known social news style domain spammers.

Any tips or similar experience would appreciated?