BuddyPress Activity Comment Notifier plugin emulates the facebook style notification for the comments made on user activity. It will show the notification to a user in following scenario When a user has an update and someone else comments on it When a user comments on someone’s update and other users also comment on that update, all the users are notified When a user favorites your activity( Added in version 1.1 ) For more details, please visit BuddyPress Activity Comment Notifier plugin page Free & paid supports are available via BuddyDev Support Forum