akismet就算只有1%的误杀率，也让人很担心，我用的过程中也不只这么低。
机器学习还是不可靠.
因为bot们一般没有达到执行js的智能程度，所以利用js阻止spam bot才是正道。
至于trackback/pingback spam，则通过判断源链接判定
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