Nearby Travelers App

I'd like to build an Android app for travelers where the main purpose is to allow the user to see other nearby travelers based on countries (by default will show travelers from the same country as the user) and allow them to interact with the other travelers. The following are features that the app will need to have: - The main interface will be a map showing user location and other travelers nearby based on the user's original country (settings should allow changing this to specific country or 'show all travelers'). Nearby here is within 5 miles by default, but should be changeable to maximum 10 miles. - The second main interface is to show recent pictures uploaded by the nearby users (of the same user country by default). Recent here means within the last 5 days. Any pictures more than 5 days will not be shown. - Profile page containing photo, bio, country from, and current location - Extended profile: A page that shows a general world map of countries the user has been (similar to 'BeenApp'), with a small text at the bottom showing how many countries they've visited (eg: 23/196 - 11.73% of the world) - The ability to upload/post public pictures - this will be automatically resized to fit a mobile experience (similar to Instagram). Users can comment/like the pictures. Picture owner can delete comments. - The ability to register/login using one-click Facebook login - GPS or IP address tracking of accurate user location - Notification at the top of the app telling how many travelers from <user country> are nearby - The ability to set the account to private - so their location won't show on the map - Messaging feature - users can send and receive messages with another nearby traveler. They should also be allowed to invite another nearby user into the same chat (group chat) - Standard account privacy features - eg: set account to private mode, block a user, disable account, etc The deliverable should be: - Working Android app - Full source code Please see the attached image file to show a general idea of what the app might look like (the image is just a draft guide, and not necessarily have to look like that)