ABSTRACT This study investigated attachment style differences in online relationships with regard to interaction characteristics and relationship satisfaction. The effect of relationship type was also taken into account in these investigations. The findings suggested that attachment style differences in interaction breadth and depth were present only in casual friendships. Preoccupied and dismissing individuals had a lower level of interaction breadth and depth than did secure and fearful individuals within this type of online relationship. A same pattern of attachment style differences was found in relationship satisfaction of casual online friendships. 60