There is no formal rabbinical oversight on Mi Yodeya. That's why it's especially important that we treat the site as a source of information, never p'sak.
Some participants here are rabbis. I actually don't know if any moderators are rabbis; they haven't publicly declared. Moderators moderate based on Stack Exchange rules and norms and common Jewish values, but we don't make a stronger statement. (On Jewish values, I'm referring to editing or removing content that might be accepted on other sites but that violates our community norms about modesty, lashon hara, and so on. I don't mean that we impose other kinds of religious restrictions.)