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Comment contamination?

Suddenly I have a bunch of comments on older posts, some of which appear to have been intended for another evolution-related blog. For example, they refer to comments by others that aren't on my blog. I use Movable Type. Any suggestions?

Hmmm... they all link to the same Facebook page. Looks like some kind of spambot that uses comments from blogs on related topics. I'll try switching to reCaptcha screening.

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