iOS and Android app for announcements

I actually need an instagram like app but especially for supermarkets. The customers shall be able to follow the supermarkets and they shall be able to get notifications and/or see the discounts on the timeline or on stories. The supermarkets shall be visible on a map view or list view, and when the user clicks on the supermarkets icon on the map/list then the discount detail shall be shown. The user shall be able to follow the following things in a certain distance radius, i.e. 500m 1km 5km 20km 50km, 100, online: - shop - brand (if the products have a certain brand, like nike, puma etc.) - category (clothes, shoes, food, drink etc.) - keyword (e.g. #turkishfood #apple #biryani etc.) a chat function would also be good between customers and supermarkets. The users shall also have the possibility to like and write comments about the discounts. The more likes the discount gets, the more it shall be shown as most viewed or liked as the hottest discounts. The supermarkets shall be just able to post photos, text and videos of their discount offers. The shops shall be able to register themselves via the app or homepage. Admin confirmation is needed. Attached I made a sample draft, it could look like this.