In order to stop comment SPAM, the best technique IMHO is to implement a word blacklist. Here's a sample blocklist that I use for all my blogs. When choosing words to blacklist, don't pick everyday words or you'll end up with zero comments. SocialTwister made exactly this mistake. They block words, like fund, fun, feed, fed and almost everything else. Try commenting on this blog, it's quite funny. I tried for several minutes and wasn't able to even get simple sentences past their comment SPAM filter. Unsubscribed.
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