Yahoo! Answers is a good place to get traffic and back links to your site. Although links are no follow, there are a lot of auto blogs will copy content from there and post to their blogs so your links will be broadcasted everywhere.
However, posting your links to Yahoo! Answers is not simple. As there were thousands of bloggers add there links to spam their site so Yahoo is very strict with this. In order to add hyperlink on Yahoo! Answers, you have to be level 2 (250 points) or higher.
Yahoo! Answers Points Table
Yahoo! Answers Levels Table
Check out Yahoo! Answers Points and Levels for more information.
Note: if you’re on level 2 or higher, give a full URL ex: http://4rapiddev.com to add your links.