In my research I noticed that Alexa reveals too much confidential information, in my view, about web sites. Something I don’t think web site owners would like other keyword hugry people to see. So, I installed KB Robots.txt wordpress plugin to block Alexa and added these contents to robots.txt. It’s not much, but it should keep Alexa away.
User-agent: * Disallow: User-agent: ia_archiver Disallow: /
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