In the context of both the Brony and the Furry fandoms, we have observed fans that fall within the wide spectrum between the Extrovert and Introvert personality types.  Furthermore, when among like-minded fans some folks switch from one side of the spectrum to the other.
DRWolf and Teric artwork created by Flaminbunny:
http://flaminbunny.deviantart.com/
My Little Pony Characters and Images belong to Hasbro.