But still you can get traffic from these sites as your posted link will be shown as text and if a person is interested in your answer and may visit your site.All these sites allows adding website links in your profile section and this increases the chance of people visiting your site when they visit your profile.Be active in these sites and keep answering without spamming and your level gets upgraded and gradually you are awarded with quality backlinks and targetted traffic to your site.Use this list of free and popular q&a sites and make these sites as your traffic generating sites.
answers.yahoo.com
wiki.answers.com
qna.rediff.com
www.answerbag.com
www.linkedin.com/answers
www.aolanswers.com
askville.amazon.com
www.simplyexplained.com
www.askeet.com
www.allexperts.com
www.askdeb.com
www.blurtit.com
www.fluther.com
www.theanswerbank.co.uk
www.grupthink.com
Tags:q&a sites for quality traffic,targetted traffic,easy way to get traffic,quality free backlinks