Links to avoid

[nationwide]

What about forum signature links? Can Google loves forum and discussions links or hate them?

Forums signature links are do-follow so i must say that google likes it.
Let me tell you, i had posted an article about horror story books in one of my story book site. After publishing within 2 days i saw that my article was ranked in the 6th page of google search, it remained the same for a week but when i linked the article by a forum signature link it jumps to the 2nd page. So i must say that google likes it.