My personality type is very flexible, as I adjust to be whatever the people around me need. Examples: when I go to the theater with my acting friends and I'm surrounded by boisterous, sociable folks, I go quiet and shy because there are enough loud people around me and it makes me uncomfortable. On the flip side, if I enter a room full of shy, quiet people, I become talkative and friendly because these people obviously need a social leader and no one taking on that role makes me uncomfortable. On the average day, though, I'm more introverted and prefer to lead a quiet, private life. I don't like it when I'm drawn into an extroverted state because it wears me out (I'm a borderline HSP: Highly Sensitive Person).
My introversion coupled with the fact that I'm a writer makes me prefer the written word, so I prefer to email and chat.