Originally Posted by
Krig the Viking
This is a common misconception, created by the fact that "extraversion" and "introversion" don't mean quite the same things in socionics as they do in normal usage.
Fe is internal dynamics of objects. This means it is an internal thing sometimes expressed externally. Fe is the ever-shifting mood: excitement and passion and emotion. Fe Ego types are good at sensing and influencing their own moods and the moods of others. Being dynamic, Fe moods can shift and change, but this does not mean Fe is shallow: deep and powerful feelings of passion, love, anger, hope, etc., are all Fe. At its strongest, Fe can be an all-consuming fire that overwhelms everything else.
Fi is internal statics of fields. Fi is all about the connections between people: like and dislike, good relationships and bad relationships. Fi can be friendship, loyalty, trust, dislike, mistrust, hatred. Fi Ego types are good at determining the status of relationships, which people are to be trusted and which are not, etc. Unlike Fe, Fi is a very stable thing, solid and seldom changeing. At its strongest, Fi is an unbreakable bond between people that will resolutely weather all storms and anything that may be thrown at it, or an unswerving loathing that will give no quarter to the enemy.
That's my understanding, anyway.