Google counts the links to your site, and if there are more links to your site than to your competitor's site, then you go up the rankings.
So if I were to put a link into my signature, that would mean that I would have a thousand links counted by google's robots. Its a bit more complicated than that (which is why they don't set up their own forum and just post link after link), but not much.
Impressive, Huh.
You can also raise your rankings by paying google some cash.




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