BuddyPress
Adding Forums to your BuddyPress Site with bbPress
The main BuddyPress Forum component is bbPress. This is a core piece of software created by the creators of WordPress and it is pretty much fully integrated into WordPress and BuddyPress. With bbPress you can create two types of forum in a BuddyPress context – Site-wide forums and Group Forums. Site-wide forums have to be setup by the site admin whilst group forums are optional aspects of groups that are enabled by the group creator.