This module lets community builder users, view in a real time mode (using ajax) if a friend of theirs has logged in. A nice window appears on the bottom right corner of their browser containing the avatar and the username of the logged in person.

This extension helps your user's interaction as well as increases the quality and looks of your social site.

Demo Video:

 

If  you are interested to this product, you may want to have a look at:

Possible Friends Module For Community Builder