Deeper Linking: Deeper Links Explained
Three types of links: On-domain links, Off-domain links, and No-Follow links. Each type of link is different and gives its own type of optimization to a pages it links to. We have derived our score to assume that the current domain wants to keep as much focused PR as possible so we mark down pages that link outbound more then a certain percent of the time.
On-Domain links: These help PR and generally boast a score because links are flowing back to the domain where the webpage is located and the pages inside the domain are likely to flow back to the original page.
Off-Domain links: They don’t hurt a page but they weaken the domain’s focusing PR power. We encourage people to link to good resources and it will not penalize a page if there are one or two links going off site. However if a page is 100% outbound links then at that point we drop the score a few points.
No-Follow links: We disregard these links and they are neutral. You can learn more about them by searching for “rel=nofollow” on your favorite search engine. We only want to see rel=nofollow links when third parties are adding the links. If you think the resource is quality then websites should not fear linking to it and giving them some PR. It actually shows search engines the site is a quality hub site. Another scenario for use would be if a link was to a third party and it was excessively used. This type of heavy linking to another site bleeds a site and we suggest it be sparingly use it in these cases.