Well just like you can get spam messages in your inbox, people will leave spam comments on your blog.

就像你能够在你的收件箱中得到垃圾广告信息那样，人们可能会在你的博客中留下垃圾广告评论。

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Robots may post lots of spam comments into your database. You can add a verification code image or a math equation to avoid this.

于是便动手写了一个插件，不仅可以采用数学等式验证，更可以使用图片验证码。

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Page administrators can then go through and unmark as spam those comments that were wrongfully hidden.

FORBES: More Facebook Lessons: How Filters Can Bite You in the Banana

The filters are set to hide comments they suspect as spam.

FORBES: More Facebook Lessons: How Filters Can Bite You in the Banana