They should appear immediately, as soon as you've clicked the <Save> button.
WikiAnswers is set up to recognize duplicate questions, but if there's even one word different, both questions will appear. A WikiAnswers Supervisor will usually catch this and combine the answers, eventually.
No, wikianswers is not inferior to yahoo answers.
WikiAnswers is a global site. People around the globe are entitled to their opinions, just as you are. Some people can be a little harsh when they answer. Also - since there's no minimum age for contributors, some answers may appear immature.
Answers and WikiAnswers appear in all search engines. Just click the result. You do not need to be registered just to read.
WikiAnswers is owned by the Answers corporation.
Wikianswers.
Yes. For your information, the site that you are posting this question IS WikiAnswers. Sometimes, it is true that WikiAnswers' answers are not true. However, most of the answers are true. Sometimes, there are vandals who make turn true answers to false answers, but it is false to say that WikiAnswers is not true. To find out whether WikiAnswers' answers are true, sign up now to become a true WikiAnswers Contributor! Be true to yourself if you get addicted!
Google Answers crashed and burned due to the lack of accurate answers and the fact that no one could edit the answers that were on Google Answers. WikiAnswers allows anybody to contribute, and doesn't simply search for answers - WikiAnswers MAKES answers. With the help of WikiAnswers' rival, Yahoo! Answers, both inadvertently teamed up and crushed Google Answers out of the answers competition.
There is no way to guarantee that the answers on WikiAnswers are all 100% correct.
WikiAnswers is constantly being "modified" with new questions, answers, and changes to existing answers.
You can't answer answers on WikiAnswers, or anywhere for that matter, unless there is a question in the answer, where it would be classified as a question.
You just have to click on questions that have been answered and they will appear. If you have a specific question you can ask it and hopefully a member of the community will answer it as quickly as possible!