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IMO @engrave would be revolutionary if it allowed optional guest commenting through disqus, ads and blacklisting users so their comments don't show up on the blog (i.e. bots and spammers). This would allow for a clean blog anyone can access, further boosted by other sources of monetization.

We're going to allow quest comments soon but without Disqus at all. Blacklisting users will be available soon as well, we're actually working at it right now :)