SEO Earnings

With the general idea of how PageRanks are calculated, some webmasters form a group of web pages linking together to form a link farm to boost up the PR of its page. As these kinds of link farm are generated by automatic programs without actual content in it. Most search engines regards these kind of link farms as a spamindexing to them. Once spot out, you are going to be banned agains.

However, there is no clear definition to tell whether your sites is a link farm or not. You encourage your user to exchange links with you. According to some search engines' guildlines, such as Google, they recommend that webmasters request relevant links to their sites (conduct a link campaign), but avoid participating in link farms, otherwise, a site that participates in a link farm may have its search rankings penalized or even the removal of the whole domain to be indexed.