Create a cross platform mobile app for users to choose hastags in Instagram (IG) and locations and then the app will follow the accounts found. The user should be able to write a custom message for all matched accounts (the same message would appear).
The application would then unfollow those users after a user defined period like 30 or 60 days. The user can turn this feature on or off at anytime.
As the user accounts have varying memberships, the number of followers added in a day should be able to configured. So if i have bronze, silver and gold memberships, they will add 250, 500 and 1000 users respectively.