Is there any other websites like Yahoo answers that are widely used for question and answers(and especially those that are do-follow)?
I would suggest looking for other traffic sources, this traffic doesn't stick around for long and doesn't help you long term.
Here are a few of the key ones for you: www.allexperts.com www.ansmart.com www.answerbag.com www.allexperts.com www.ask.metafilter.com www.wondir.com www.askville.com www.qna.live.com www.yedda.com Of course, this is not including niche specific Q & A sites like www.expertsexchange.com etc. but i hope the small list i provided will suffice
yeah definitely http://www.hitwise.com/datacenter/rankings.php as you can see yahoo is way at the top of sites although yahoo answers isn't in there.
I think he's saying that there's no reason to post answers on yahoo answers if you're just doing it for its own sake. It's a waste of time. So the OP is probably asking to know if he should spend time answering questions involving links, and Gallito is probably saying that it's not worth spending time on Yahoo Answers at all, and to look for alternative ways of generating traffic.
Askville and yedda give the best traffic after Yahoo Answers for me. This is purely my visitors writing the answers and not myself.