There are six distinct types of crowds that form on Twitter based on the shape of connections between users discussing a topic: 1) Polarized crowds have sharply divided subgroups. 2) Community crowds consist of tightly interconnected groups. 3) Brand crowds form around corporate/organization topics. 4) Bazaar crowds bring together various interested parties. 5) Broadcast crowds have a central influencer and surrounding audiences/communities. 6) Support crowds assist and provide feedback to companies.