Interesting study, with the participation of 17 experts in SEO, almost about 40 factors that could influence whether or not the value that the search engines you can assign to a link. The paper points out the impossibility of arriving at a 100% accurate, but if it is a document that the treatment which is performed by the depth of content, can be a very interesting information. Each factor has been evaluated on a scale of 1 to 5 by the participants. This will pass review factors such as: Is the text of a link a factor on the value of a link? Does the age of a link takes effect on the value of a

With respect to the optimization of our site to search engines (SEO) there are times when we find contradictory opinions and instructions to the search for information. In the end, and having consulted several sources, is still likely that we could raise questions as: Are meta tags, what factors penalize our positioning, how can we get to ban Google?, bots respect the "rel = no follow?", etc.. In this sense we can be very useful to use a starter guide us a bit of light. If this guide has released a browser, better. If, moreover, the search engine which has published the guide is Google, it goes without saying that all that we are slightly concerned