ENFJs can be just as introverted as INFJs or INTJs. Because we maintain such a large network of friends and social friendships [most of which are based on us being the service providers] we have to retreat into ourselves for long periods in order to engage Ti [which is traditionally our weakest function]. At times it takes us 1-2 days or even weeks to analyze a logical situation and come up with an appropriate response to a social dilemma. And in that time, we retreat from the world. Because of this need to mull over social situations, ENFJs are considered to be one of the most introverted of the extroverted types.