Two major ends of app:
1. lets user type some message then input a radius value from his/her current location or registered shop location.
[login to view URL] other people (from their current location) will enter just enter a radius value to get the all messages falling within that radius.
Illustration:Say a local business person input some sales or offer message and kindof broadcast it to a comfort zone of 5km radius from his/her shop location then a random person just wanted to know what's going on around him so just puts a radius value of say 2km from his/her current location.
so every updates within 2km range will be visible to person. Additionally one more seperate window will be present (kind of first page after login) in which updates by shop owner could be seen if user is failing under the defined distance given by shop owner.