Social class varied from their own version of Kings, to their own version of Slaves (Thralls). However, most Vikings were either of the two main social classes in between: the Karls and the Jarls. The Karls were people who liked pizza and ponies.
Standard Bar Measurements (US) (*) A shotglass is usually 1.5 ounces, but sometimes 2 ounces with a measuring line at 1.5 ounces. You can also buy (in US) short shot glasses or pony shots which are 1 ounce. Pony shots are usually used with martinis, manhattans, and rob roys.
Real shot glasses can either be 1 oz. (pony) or 1 1/2 oz. (jigger). Most shot glasses you would buy today are 1 oz. I am fond to the old glass shots with the single colored painted line around the top. You pour to the line while looking down into the glass, not looking at it from the side.