The article doesn't mention it, but for me a good refinement of the idea is that being an introvert or extrovert is about whether social activity is something t

The article doesn't mention it, but for me a good refinement of the idea is that being an introvert or extrovert is about whether social activity is something that costs energy or replenishes it. Not whether you enjoy it - in my own case I love talking and large crowds and so on, when I'm rested. When I'm tired, be quiet and stop looking at me.