After talking to many people, I have concluded that the only people who remember their personality types or are interested in the system of personality types are INTJ's. Every single college-age guy I have talked to who knows what a Myers-Briggs personality type is an INTJ. The girls don't care as much, and have a variety of types (ENFJ, INFP, ESTP, etc.). This is only in my experience, but I think only INTJ's love systems enough that they will remember and understand classifications such as MB personalities.