[PappaPatat]

Build an app that would remind you about things to do when you are in the vicinity.

Rational: there are plenty of things in my live I should do that are not time based, but location based. Post a package to a friend: when close to a postoffice. Buy shaving foam, when close to a supermarket. Buy these earrings, when close to that jewelry shop where she pointed them out to you. Buy flowers, when close to a flower shop. See that exhibition, when walking by. Visit a friend, when close.

Include the option for businesses to send you sweet deals when close and you'd be making money to pay the salaries.