http://mbtitruths.blogspot.se/2013/01/the-functions-explaine...
"Feeling
Extraverted Feeling - Fe users take as their primary focus group values and feelings. Their own emotions are strongly influenced by the emotional atmosphere and other peoples' emotions. If others are having a bad day, they're having a bad day. When asking about the ethical thing to do, they refer to societal norms - what OTHER people feel. They want their peers to agree with their opinions and may feel bad if others disagree. If they've done something immoral, their strongest cues will not be how they feel, but if those around them have an unfavorable reaction. But because they are more aware of others' feelings then Fi users, they are better at deliberately doing or saying things that give people positive feelings. These are the types of people who can be referred to as "people-pleasers." Their facial expressions are often quite animated, with big flowing natural smiles. Teachers, hosts, caretakers, diplomats, politicians, salespeople, receptionists, waiters/waitresses, PR reps, missionaries.
Introverted Feeling - Fi is basically Feeling turned inward. Those who use this function have feelings that are more hidden from view; they are less obvious and they may only share their true feelings with their close friends and family members. To decide if something is moral, they simply ask themselves how THEY feel. So if everyone thinks that eating chocolate chip cookies is okay, but they feel that it's truly wrong, they will have a personal problem with seeing people eat chocolate chip cookies and not eat them themselves. They are not as expressive as Fe users, but they probably feel their emotions more acutely since they don't convey them directly. If Fe is direct expression, Fi is indirect expression. Instead saying "great job, you rock!" they would give thumbs up with a sincere smile. They also focus on individual feelings rather than group feelings. Their facial expressions are rather constrained and may give the impression of pride and passion. Artists, poets, composers, therapists, counselors, writers, speech pathologists, photographers."