Originally Posted by jhonden
I have heard lot about QandA sites but i didn't understood the method to use it and how it can be beneficial for link building.
The idea is simple: by answering questions you can have the opportunity to place a link with your answer. Or you can ask a question of your own. Questions are in different categories so you can browse those you fell you may be able to help with. It isn't really hugely different from a forum situation except that rather than a developing discussion you just post one reply, and it is usually for the questioner to decide which answer (if any) they feel is the best one.
As with many forums, links are usually nofollow.