It's a plugin that show notices about new DJ-Classifieds adverts in EasySocial activity stream or change.
This plugin comes free with the subscription of the extension. You'll find it installed (you may need to enable it manually) after extension's installation, alternatively it's available in downloads section (available for active subscribers).
Enable stream on new advert - decide whether to enable or no
Enable stream on advert edit - decide whether to enable or no