Quote:
Originally Posted by mupha
Useless for passing PageRank, yes, but PR is not a SERPs ranking factor whereas even a low PR backlink from a page with relevant content (providing that page is indexed of course) has the potential to create a small - often very small - positive effect on SEPRs.
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PR is a major SERPs ranking factor. It remains the cornerstone of it in fact, though anchor text is more important.
A forum link from a page with "relevant" content will have virtually no effect at all, and that effect could be positive or even negative. Google isn't perfect, but they are not morons. They know things like signature links should be completely ignored in the same way
blog comments should be. A webmaster adding his own link to some webpage shows no value at all and, if possible, onviously should be completely ignored.
Websites with extremely high ratios of garbage forum links are setting themselves up for a negative link profile. If a search engine thinks a webmaster is the only one running around the Internet saying "hey, I'm cool", they are not going to be very impressed, and very possibly will view the domain as a spammy "link scheme", which is basically the intention of such a webmaster.
having sig links probably will make no difference unless you have unique link text like "elegant yak automobiles" or something like that. As Mark said, sigs should be viewed like they were intended - to say who you are and invite humans to check you out.
(Plus, yes, they will help a small amount with getting pages crawled... which suggests sig links to obscure, deep pages make more sense than links to the main page of a domain or another high profile one that gets crawled via 100s of links from your own domain.)