When I read posts like this, or watch introverts doing comedy skits about their introversion, such as KallMeKris saying she needs 10 days in advance just to schedule a phone call. As an extrovert, I don't want to inflict angst upon an introvert just by striking up a conversation or inviting them to lunch. I cut off two "friends" who were introverts, and I don't think they noticed. Human kind is a social animal that expects reciprocation and teamwork.