What follows is a clarification of how back linking functions, a portion of the different types of links there are and how they all draw together to move your key phrases and their related pages up through the search engine rankings.
High Page Rank Links.

Not all links are made equivalent. Google and the other search engines have a ranking scheme whereby a link originating from a site having high page rank is measured to be much more significant than a link coming from a site or blog with a low page rank. For instance 1 link from a site with a page rank of 9 would be worth a thousands of individual links originating from blogs with a page rank of 0.

Some of the article submission sites have a high page rank and it's certainly worth your while to have high quality articles composed so you can get inclusion on these article directories. Some of the article submission sites consists of high page rank and you get the chance to put a maximum of two links back to your site in what's known as the resource box that goes on the end of each article. You have to do your research on which article directories to use as there are a lot of directories with a low page rank as Google considers the articles on these to be of low quality. Ezinearticles.com is considered to be the best article directory as they just allow in great quality articles.

YouTube Links:

YouTube is another site with a high authority ranking. Uploading well optimized videos with a link back to your site has dependably been considered as a good strategy for quality backlinks, particularly since Google is the owner of YouTube!
Bookmarking

Bookmark links are social links. These will for the most part give a lower quality of link back to your site however are important to the linking mix. It would look far too unusual to the search engines to only have links going to your website and pages from websites with greater page authority. There are literally hundreds of bookmarking sites, some popular sites are Delicious, Stumble Upon and Magnolia

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