Unfortunately, we do not have the capability yet. But it is something we are thinking about.
No, you cannot, just as you cannot "unrecommend" a user.
Yesss
Every time someone is genuinely helped by an answer given on WikiAnswers, we know that it is not a failure.
No. Chatting is not against the rules of WikiAnswers.
Yes, if you have patience
if someone there has a computer then yes.
Someone elses delete's their answer.
If someone is claiming to be you on their WikiAnswers profile, please contact WikiAnswers @ Answers.com (no spaces).
There is a high probability that someone on wikianswers has written an essay on it. That does not mean that they still have it available. If you are asking for someone to write an essay for you then that is not the purpose of wikianswers. Wikianswers answers questions it does not do your home for you. There is a word for that. Cheating.
This question in not appropriate for WikiAnswers.
You write your answer
As of August 2013, there does not seem to be a way to unrecommend an answer on most answer websites. You can always post another answer and explain that you no longer agree with the previous answer that you had recommended.