This component is near to yahoo answers. Rank and point system. Email on asking and answering Questions.
This is a free Question and Answer Component. We are continuously improving the product based on user suggestions.
We also have a forum where you can come and give suggestions or complain about any issues. Check the demo you will definitely like it, than you can download and use it in your site. Above all it is completely free component. Questions and Answers can be shared using social icons. This extension supports gravatar. Users can create their avatar through gravatar dot com.