>introverts recharge by being alone, and being in a large social function is draining; extroverts recharge by being in large social functions, and are drained by being alone.

Very few to no people fall into this dichotomy - whether or not I feel "recharged" by social interaction or solitude is not static. It highly depends on my mood, who I've been spending time with lately and and what I've been up to. It also depends on who, specifically, are at the social function.

It also has changed at various times in my life.