I just heard from a friend yesterday that answering questions in http://answers.yahoo.com/ and http://www.answers.com/ really helps me to create lot of back links for my site. Is that true? How? in what way? Because as far as i know you can't be able to put links on yahoo answers, this will lead your accounts to be banned if you put your links to your answers. Then how this will help my SEO tactics for my site? Any help please?