I need an app where people can post adds for there area and people can enter in there zip codes to view the adds posted in there area, the people searching for posted adds should also be able to enter a search radius from there zip code. for example I enter my zip code as 85259 and can search the sales adds placed within 5miles, ten miles,20 miles, 50 miles, 100 miles, Etc. would like each person to have an account they log into where they can manage there posts and private message each other but if the private messaging is too costly then we can just have the posters include contact information in there add. and if it is too costly to have accounts where they manage posts then we can just have it set up to where anyone who purchases the app can click a button to post an add and then when they wanna delete it they have the option of clicking on the add and deleting the add. another goal is to have absolute anonymity for the users of the app. if there is anyway to provide some sort of vpn software or someway to make our users mostly untraceable?