Use "Followers Observer for VK" application to be on track who subscribed or unsubscribed to/from your VKontakte group or public page. Application is helpful for those who are using VK group to promote their service or product. Maybe you need to know who just subscribed your VK group to contact this person in order to offer some new deal or maybe you need to know who just unsubscribed to ask maybe you need to improve your service or your product need improvement.

Advantages:
- unlimited number of groups can be added;