If you wanted to rank your website or if you are interested to do an SEO then you need to know that, answer posting is one of the ways of SEO. when you posting answer any answer posting site then you will get more traffic and you will get more backlink. which is more helpful to you for rank your site on google first page. you can add your website link to the answer. Many answer posting site is available on google. like that Quora answer post site, answer.yahoo.com site, etc. If your answer will be an unique then you will get more viewers. so if you wanted to do SEO then you should create an answer posting account.