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Won't really do anything, anymore (as pointed out in Lipine's link). I get hundreds of thousands of impressions on my websites from spiders crawling them, and I've never implimented that meta tag.
I hate how all the information is outdated on search engines when it comes to things like this, but people ignore the fact that it's just about putting keywords in your content, and not trying to trick the engines. SEO has stayed the same all these years if you've been doing it right from the start.
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