Ninjas in lore specialize in not being seen. However, here is a group of community supporters inside Microsoft who are building community around the the TechNet wiki. Inside Microsoft, the employees working on this are called TechNet Ninjas. They are not so much into the hiding. They have a blog.
One of the most prolific* of the Ninjas, Ed Price, sat down with me recently for a chat.
Here is the short (~5 min) video.
You can also follow the Ninjas on twitter: http://twitter.com/#!/WikiNinjas
*Ed’s profile pageallows you to see all his activity, and marvel thereat