I would have to say everyone wears a mask, if they didn't then they would be the same person at all times and never filter anything. They wouldn't seek any acceptance etc.
I wear many different masks. And this can be taken many different ways. I wear the mask of a parent, teacher, construction worker, carpenter, writer, and anything else I do.
I also wear a mask in regards to the society I am keeping at the time. I act differently if I am at a social outing that requires me to wear a tux and another if I am looking at houses in a rough part of town. If I am hiring a worker, or training someone - I wear different masks for whichever situation is best for it.