Do you think of yourself as an expert? Why?

Someone just asked a question in which they suggested that fluther had experts on tap 24/7. It is not my sense that there are many, if any experts here. Only one comes to mind off the top of my head. Mostly it seems like people here are generalists—very intelligent and somewhat knowledgeable generalists. But, maybe my impression is misguided.

Are you an expert? Why do you think so? What is your expertise?

For extra points, who gets to call themselves an expert?