『付費連結』就是購買、販售可以傳遞排名訊號（PageRank）的連結，這觸犯了Google規章的第一條——連結配置

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如果 SEO 是線上遊戲，Google 痛恨 ”台幣戰士”：論『付費連結』的違規操作

Matt Cutts and Sandy explain what it means if your site has a manual action labeled as "Unnatural links from your site" and what you can do to fix it.

Unnatural links from your site:
https://support.google.com/webmasters/answer/2604774

Find more webmaster resources at http://www.google.com/webmasters/