Different types of online groups attract different types of Internet users and elicit different kinds of participation from members.  People involved in medical support groups are different from people in hobbyist online communities.  Those drawn to groups involved with civic engagement are different from those who belong to professional and trade groups.  And the amount of emailing in the different kinds of groups varies.  This section examines different aggregations of online groups, looking at who joins them and the different levels of chatter and connection among participants.  There is considerable overlap among categories, since the average Cyber Groupie has, at one time or another contacted about four different kinds of Internet groups. The section analyzes Internet users who have ever gone to a certain type of online group. An Internet user who has gone to a belief group and a lifestyle group is counted in both groups in the discussion below.