Introvert Extrovert is an examination of the psychology of personality in with the mission of helping people better understand themselves and each other, with the ultimate goal of self actualization and personal growth. Family, relationships, friendships and the absurdity of the human condition are forefront while different personality tests such as Myers Briggs are referenced from many philosophy points of view.
Introverts would be considered more likely to be agoraphobics but there's more to it than that. Agoraphobia, once considered a sub of anxiety and panic disorder, can have many triggers from different areas.