An ID is an unregistered WikiAnswers user, and is a guest contributor to WikiAnswers. Any guest is allowed to ask or answer questions, and it is just part of the rules.
To find the user that answered your question, first find the question you asked. Then, look to the bottom of the answer where it says 'last edit by [username]'. Click on the username, and you will be redirected to their bio page.
Yes, anyone in the world can write an answer to a question on WikiAnswers. However, if you are not a registered user, you are limited to editing categories, writing the first answer to a question, and asking questions. To be able to edit a question, you must sign into an account.
A user with an ID does not have a profile. He is a "guest" who does not have an account on WikiAnswers.
Yes. WikiAnswers is based on wiki technology which means that anyone can write an answer or edit an answer.
Registered users can edit their user preferences (settings) by clicking the "My settings" link in the blue sidebar.
No one. Sometimes you will receive answer update emails with the last edit by a mysterious User ID000000000. This is not a real person, it's what happens when no change to the answer was made, but another question was merged into that question, adding an alternate. To see who made the merge, click "question history" in the blue bar.
WikiAnswers operates using the wiki-concept. This means that people are able to ask, answer and edit questions without creating an account.
The Answers platform is wiki based - any user can ask, answer, edit or vote on the quality of an answer.
Yes, there is. Look at the question's history.
A wide variety of answers are actually very accurate on this site. Unfortunately, since any user is allowed to answer or edit any question, there is room for incorrect answers to be written.
Yes, non-registered users can see everything a registered user can, but they are very limited in what kind of edits they are allowed to make. Unregistered users can ask and answer questions, view question answers, and view user's edit history. However, they are not allowed to rename questions, or edit answered questions.