Somebody (possibly the owner of 51wisdom.com, 56918.com, liaozhi.org, myseo.com.cn, newboyu.com, and seo88.com)
have been spamming wikis,
blogs, or guest books with the keyword 网站推广 to
improve their page rank on Google and other search engines.
More information
If you want to find out more about the problem, please visit our page about link spam.