I came across this issue, when I visited Digital Inspiration blog. He mentioned that the participation in controversial programs like PayPerPost (see my review on this program) and ReviewMe (my review on this program) might put a blog in jeopardy in term of Google search ranking.
The following is Matt Cutt comment on paid post programs.
You want my links for traffic.. totally fine..just don't make it so they affect search engines..so that's why we say use nofollow..or use a redirect which is through robots.txt
Digital Inspiration has effectively depicted and explained the situations of how and why we might get penalised for writing up a paid post by presenting a simple example. Basically, all you need to do when provide backlink to other websites (sponsors of paid posts) is to insert rel="nofollow" in
<a href="http://www.abcde.com" rel="nofollow">See further explanation at Digital Inspiration.
By doing this, the search engine bots will completely ignore the external links (not helping spam site in Google search rankings) and this help you from being penalised by google.
Technorati Tags: SEO, search engine, google ranking
