As you comment on this post please pate your blog url into the comment line so we can build up our links. Thies encyclopedia site is a good summary of European mask types historically.
Theatrical uses
Masks have been used almost universally to represent characters in
theatrical performances. Theatrical performances are a visual literature of a transient, momentary kind. It is most impressive because it can be seen as a reality; it expends itself by its very revelation. The mask participates as a more enduring element, since its form is physical.
Watch the video and describe what you saw on your blog, then find a different kind of mask in use [on a video] and share it with us by putting the url link in the comments
http://www.britannica.com/EBchecked/topic/367906/mask/9063/Theatrical-uses