The MOZ contributor Cyrus Shepard has published 20 new graphics on Google’s valuation of links. These graphics present 20 principles of link valuation that have been observed and tested by SEOs over past few year.

Shepard says, “In some cases, they have been confirmed by Google, while others have been patented. Please note that these are not hard and fast rules, but principles that interplay with one another. A burst of fresh link can often outweigh powerful links, spam links can blunt the effect of fresh links, etc.

We strongly encourage you to test these yourselves. To quote Rand, “Nothing is better for learning SEO than going out and experimenting in the wild.”

1. Links From Popular Pages Cast More Powerful Votes

Let’s begin with a foundational principle. This concept formed the basis of Google’s original PageRank patent, and quickly help vault it to the most popular search engine in the world.

PageRank can become incredibly complex very quickly—but to oversimplify—the more votes (links) a page has pointed to it, the more PageRank (and other possible link-based signals) it accumulates”.

All Links are Not Created Equal: 20 New Graphics on Google’s Valuation of Links

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