The BuddyPress suite comes with several useful widgets that you can use to promote the social network side of your site. These include a Who's Online widget that shows the avatars or gravatars of the users that are online; a Sitewide Activity widget that works like a sitewide Wire, showing recent posts, comments, and group activity; and a Groups widget that shows a selection of the groups available on the site.
To enable the widgets, just go to Appearance | Widgets in your WordPress MU admin panel. Add the widgets you wish to use to the sidebar in which you would like them to appear.
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