Importance: Low Type: Trust Google may not value forum profile links because of forum spamming.

Importance: Low Type: Trust The Yahoo! Directory has been cataloging sites for a long period of time, and many believe that because of that, being listed can rank…

Importance: Low Type: Trust A theory is that being DMOZ listed increases your rankings.

Importance: High Type: User Experience Schema are used by major search engines like Bing, Google, Yahoo! and Yandex to improve the display of search results, so that their…

Importance: High Type: Relevancy and Quality Search engines are able to recognize links that have been generated through software. An example of this is the hosted version of…

Importance: High Type: Trust Excessive link exchanging can be seen as spammy and therefore decrease your rankings.