FB like notification for buddypress plugin simply updates notifications list and browser window title in BuddyPress powered network while user is away. Install and activate it. Upon activation the plugin repeatedly checks for new notifications for the logged-in user and if any new notification is found, it does 2 things:
1) Updates the browser window title( e.g: ‘members|mydomain.com’ becomes ‘(2) members|mydomain.com’ ) and blinks/switches repeatedly between the old and new title
2) Updates the notification menu: Adds new notification(if any) items to the list and updates the existing ones(if any). E.g: from ‘You have 1 new message’ to ‘You have 2 new messages’