I can see your point of view. Something else I thought of to go along with your train of thought is..someone who IS social or friendly, outwardly happy can be depressed. There are times where I have dropped down from a manic episode and even though its like walking on glass for me to leave the house; i do it anyway and still smile at the store clerk and answer some phone calls without turning into a basket case. During those times I feel devastating sadness but outwardly I can squeak by.