Asking and answering on Yahoo! Answers is like going out into a crowded town square and asking and answering people's questions: It is a good place to start and generally people are well-intentionned. However, you more often than not ask people who have no clue about the subject they are talking about, and more often than not, people will give you outright wrong answers. Even many of the "experts" and "Top Contributors" often consistently give outright ignorant and incorrect answers. There are also a lot of trolls on some sections. Furthermore, the Y!A community tends to be quite emotional, especially on the sections "Polls & Surveys" and "Religion & Spirituality", which are almost completely unreliable. Furthermore, there are sections like "Current Events" that are used almost entirely for people's dirty laundering, i.e racist and political circle-...you get the point.
All in all, for the most part, Yahoo! Answers is a good place to start your search, but you should not believe what you see on there, even if they are from "Top Contributors" or other experts, until you can further validate it with other reliable sources.
Yahoo and Wiki Answers
Yahoo! wrote Yahoo! Answers.
Yahoo answers questions
According to Yahoo Answers,you need to be 13 to become a member of Yahoo Answers.
No,you can't.Yahoo Answers is launched by yahoo,so hence,to create a yahoo answers account,you need to have a yahoo account.
No, wikianswers is not inferior to yahoo answers.
You can ask or answer questions at yahoo answers at any age,but Yahoo Answers says that you need to be 13 to create a yahoo answers account,same for Facebook,Wiki Answers and many other sites.
No, you must sign up with Yahoo to be able to post or answer a question on Yahoo Answers.
You need to create a yahoo ID in order to do it.If you have,then click on Get Started on the right side of the yahoo answers page,fill in your yahoo id and password and hence,you have a yahoo answers id.
You simply need a Yahoo Mail ID. Through yahoo mail address you can register and then sign in to yahoo answers.
You can use the alternative of yahoo answers for Pakistan that is answerpk.com
yahoo answers is much bigger.