Nofollow

Yes, but it also unfairly penalises links to useful websites which we are quite happy to pass on our Google Juice to.

Best way to deal with spam is to delete it. We're pretty good at that.

Spammers aren't only ever after page rank - they typically just want people to click on the link and visit the site. Nofollow doesn't stop that. Deleting the spam does.
 
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