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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