Since 1997, the search engine companies recognize that some webmasters do everything possible to be indexed at the top of search results, including ways that manipulative and illegal. InfoSeek, one of the first generation search engines, make improvements in their algorithms to prevent manipulation of the meta tags that do not matter.

However, in some ways the search engines are also more aware of the economic value of the ranking of search results, but sometimes they have interests of the company, SEO’s. Some search engine companies to send representatives or be a guest at events held regularly SEO community.

Based on the principle of PageRank as a whole can be said that web pages that get high ratings is that many Web pages linked to other websites. Value rating would be higher if the Web page that leads him also to be of high quality. The value of a link from high-quality sites like Yahoo! DMOZ or can be rated higher than the combined value of connections per cent of low quality web sites.

Major search engines like Google and Yahoo! provides programs and guidance that enables webmasters optimize their site indexed properly. Google Webmaster Tools provides applications and introduce a standard XML-based map of their site, while Yahoo! Site Explorer provides a program that allows webmasters to register your site URL, check the number on their web pages indexed in Yahoo! And he saw the incoming information link.

However, search engines do not tolerate manipulative methods for optimization and justifies any means.