Extroverts: what do you get from hanging out in person?

I am painfully introverted. Hanging out in person exhausts me. Unless I am quite close to someone, I prefer the sort of communication that I can shut off at will: just like this.

I’ve heard that more extroverted people can actually gain a kind of energy from being with and around other people, and come away from it feeling better (rather than drained). If this sounds like you, can you put it into words? What do you get from being around other people (friends, strangers, anonymous crowds, etc.) that you specifically don’t get from just communicating online?