Yahoo! introduces a few changes to Yahoo! Answers: "Changing time to choose a Best Answer – reduced the wait time to choose a best answer from 4 hours to 1 hour. If you now receive multiple responses within an hour you can select one of those as your Best Answer, or choose to put the question to vote at this earlier stage. The full lifecycle of a question won't change – questions will still be open for 4 days and up to maximum of 8 days if you extend the expiration. This change gives you option to resolve or put to vote earlier. If you take no action to resolve or extend question, the question will automatically go to vote for Best Answer."
"Optional Preview screen when answering questions. If you're signed-in to Answers account and have answered at least one question before then when submitting your answer you can choose to Submit your response immediately without going to Preview page first. Also, Preview page let you see how your response will look before publishing it."