I suggest adding a Site wide activity widget similar to BuddyPress.
This feature can improve social-network interactions by announcing users activities.
It is similar to mod VBspy but with wider coverage.
This widget post announcement when:
1- There is a new friendship between two users.
2- ember updates his profile.
3- member writes a message on another member profile.
4- new group is created.
5- member joins a group.
6- banned member
7- new topic created
8- new post
9- new forum created