Yahoo! Answers - Q & A Online Service
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In its home page, you can ask a question, open a question or search for answer instantly.
Now, Yahoo Answers will automatically select the appropriate category for your question. On the other hand, you can hand pick the category you want. You also have the option so Yahoo! Answers will e-mail you once you have received an answer. Click Preview then Submit.
After posting, you can extend the expiration of your answer and give additional details to your question. When you answer become the top answer of the question of another user, you will receive points. Hence, when you ask questions, you will be deducted also.