It's no secret that having links from lots of different web sites is important. There's an argument that the IP address of each web site also plays a role. For example if I have ten domains (all linked to each other) under one hosting package (which means they share the same IP) I get a little boost. Take the same domains and put each one on a different host and I get a bigger boost. There is some evidence to support this claim in the form of a few examples, but a more sytematic test would be nice. There's another discussion on the same forum about different IPs.
I'm always talking about anchor text, and I see competitors with 30,000 pages indexed beating my 800 or so pages. I figure the anchor text from those 29,000 pages is what's killing me. I'm certain that's part of it, but the IP addresses of incoming links may play a bigger role than I thought while links from different domains may play a minor role if they come from a common IP.
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