Social networking in a box. Build a social network for your company, school, sports team, or niche community.
You can download and install BuddyPress using the built in WordPress plugin installer. If you download BuddyPress manually, make sure it is uploaded to "/wp-content/plugins/buddypress/".
Activate BuddyPress in the "Plugins" admin panel using the "Activate" link. If you're using WordPress Multisite, you can optionally activate BuddyPress Network Wide, allowing its toolbar integration to appear on all of your sites, and optionally turning on post and comment aggregation to the Activity Stream too!
Try bbPress. It's designed to work cohesively with BuddyPress Groups, Profiles, and Notifications. Each group on your site can choose to have its own forum, and each user's topics, replies, favorites, and subscriptions appear in their profiles.