I really don't think they do.
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So far, there isn't a list that lists every member on WikiAnswers. However, there is a list of every Supervisor on WikiAnswers, just not every member that WikiAnswers has.
While other questions and answers websites exist WikiAnswers is the best by offering the Wiki platform for people to share and collaborate their knowledge. WikiAnswers is different from other sites where each answer stands alone and you can't get to one comprehensive answer. Another thing that make WikiAnswers best is that it offers alternate wordings to each question reducing the possibility of duplicate questions asking the same thing, and then offering people to work on one question with one best answer. See the link below for a list.
There isn't a monthly list (or any list at all) of users who signed up for WikiAnswers. A list of users is not kept, for the list would be far too long, as WikiAnswers has millions of users worldwide.
Wikianswers, because ask.com just shows you other websites.
Click on the related link called "List of pages on WikiAnswers watchlist."
Yes, there is a complete list of all the Senior Supervisors on WikiAnswers. See the related question below for that list.
No, WikiAnswers does not have a log in API like Google or Facebook, so you can not use your WikiAnswers account to log on to other websites. Websites owned by Answers.com may allow you to log on with a WikiAnswers account, but 3rd party websites will not. If you see a third party website asking for your WikiAnswers password, do not give it to them - they are most likely trying to scam you out of your account.
Promoted questions are questions chosen by the WikiAnswers team to be promoted. This list is different than the Featured Questions list.
No, WikiAnswers and Wikipedia are two different websites.
Wikianswers does not list employment positions.
No, it is not on my list.