On V'Dibarta Bam, the Mi Yodeya chat site, one can often find a user named "Meta-Man" sharing interesting meta-posts about site governence or pointing out interesting discussions, but I cannot tell who or what Meta-Man is. It could be a specific moderator with a different name on Mi Yodeya Meta. It could be an avatar used by various moderators to post interesting things. It does not seem to be a standard user profile since it is not listed as a user on the main Mi Yodeya users list or the Meta users list.
He likes to help out but very much prefers to remain anonymous.
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