An outstanding piece from Rand Fishkin detailing research into different types/aspects of links and which affect SEO more. The list in brief: #1 - Links Higher Up in HTML Code Cast More Powerful Votes #2 - External Links are More Influential than Internal Links #3 - Links from Unique Domains Matters More than Links from Previously Linking Sites #4 - Links from Sites Closer to a Trusted Seed Set Pass More Value #5 - Links from "Inside" Unique Content Pass More Value than Those from Footers/Sidebar/Navigation #6 - Keywords in HTML Text Pass More Value than those in Alt Attributes of Linked Images #7 - Links from More Important, Popular, Trusted Sites Pass More Value (even from less important pages) #8 - Links Contained Within NoScript Tags Pass Lower (and Possibly No) Value #9 - A Burst of New Links May Enable a Document to Overcome "Stronger" Competition Temporarily (or in Perpetuity) #10 - Pages that Link to WebSpam May Devalue the Other Links they Host Check the details at SEOmoz. Frank
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