A thread a SEW started by Dave Hawley asked the question…
Do forum signatures really help with Google ranking?
Well my spin on this is it does, same as Blogs, Guestbooks etc etc… But not very much, the more I look at Google the more I see Themed links working…
If site A has 100 backlinks about PHP and is a site about PHP a link from that site will weigh heavily from PHP related terms like “programming”, if you run your search terms via a ontology script you get other terms like:
Search Term: Blue Tomatoes tomatoes
So a good “Blues Tomatoes” link should be coming from a themed site which has one of the keywords from the above list, so by default if you linked to a Viagra site the link should weigh a lot less… if that makes any sense… of course if 110,000 non themed links say “Blue Tomatoes” but that’s a different story all together…