Yes it is helpful. In yahoo answer you will get knowledge about SEO and also on many other topics.It is place were u can ask any quires regarding any issue.
I think he means does posting an answer which also has a link to your web site helpful for SEOing your site. I don't know the answer to the question but am also curious.
Don't try to SPAM Yahoo answers with links back to your website. Just drop a link where its required. Just adding link with every answer (if its not required) might result in ban. But here is tip, if you have some informative pages on your website or blog and there are people asking questions about similar information, you can drop a link. But it should help your answer. Or you can create informative page based on what people are asking on Yahoo Answers. Then look for new un answered questions in future to contribute. Its debatable if there is any SEO benefit for links as all links are NO FOLLOWED. But in SEO community some think that NO FOLLOWED links are also having some value. So not a bad idea. But as I said earlier better not to contribute considering just link value, there are better benefits of it than just links.
they can be much helpfull for seo but you should reply carefull so that no one can report your answer. use smartly your links as a source. you should reply earliar before the question is closed.
yes yahoo answers are always very helpful for off page SEO and if you use yahoo answers in good way then you can also get a very decent traffic from it
Yes definitely , yahoo answers is great source to convert prospect to customers , its too targetive .
i belive yahoo answers is good for seo and will improve rankings. even if the links are no follow they are reported in my google webmaster account as backlinks from yahoo.com
Yahoo answers help you in promoting your site. As nhc1987 said don't add links to your site unnecessarily, have links if essential. Yahoo answers help you in bringing traffic to your site. Links you place in your answers are no follow links. It doesn't add in back link count.
Yahoo Answers create benefits in SEO. It is also a reliable site if you have questions that you want a solution fast. There's a lot of interesting topics that you want to solve to help others.