Thread:Josephyr/@comment-13055710-20150612202946/@comment-9380534-20150612205214

"It's rather experimental (hence no special announcement), subject to change, and confers no special benefits. We might have more to say on this in the coming weeks, but it's really dependent on how well it works. I wouldn't put much stock in who is or isn't tagged right now"

- Kirkburn

Basically, it's given to users based on activity. It holds no power, other than being a user tag.