The number is an IP address, for anyone who is not a member or anyone who is a member but isn't logged in. It enables you to be identified.
A user marked by their ID is not a registered user. Therefore, they do not even have a name. These users are considered 'guests' to WikiAnswers, since they do not have an account, and are identified by an ID so their contributions can be tracked.
WikiAnswers' users email addresses are not public. However, there are some users who post their email addresses in their bio.
WikiAnswers may appear to be naive because many of its users act that way. Like any website, WikiAnswers has both mature and immature users on it. In short, WikiAnswers itself is not naive, it just has some naive users on it.
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WikiAnswers cannot provide information on how many celebrities use WikiAnswers, as private information about its users is confidential. There are some users that claim to be celebrities, but these cannot be confirmed.
Some of the users at WikiAnswers are professionals in their area, and some are not. When you ask a question, everyone has the opportunity to review and answer.
Some users on WikiAnswers put in some painstaking work into answering questions.
No, you do not have to sign in to contribute to WikiAnswers. In fact, you don't even have to register to ask or answer questions. However, there are some functions that are reserved for registered (and signed-in) users that are no accessible by unregistered users.
Many people around the world use WikiAnswers. Many of these people are registered users here on the site. Some of the users are bots, computerized users that help to fix up the site by flagging, editing, and other many things.
WikiAnswers itself technically does not lie. However, there are some users that decide to vandalize, spam, or put incorrect/inappropriate answers into questions.
People who aren't members of WikiAnswers (or aren't logged in) are identified by ID numbers.
Some WikiAnswers users like to format already existing answers to questions on the website.