I love to gather with friends for lunch or happy hour after work, and I am not alone, a lot of people do. When it's over lunch, you don't have a lot of time, want a nice and not so crowded place and you want it to be near your office, as the person you meet with do. Add a third person on top of that and it can be chaotic.
So I have always dreamt about a simple yet effective application: you enter the addresses of the people you want to meet with, the app calculates the equidistance meeting point and it offers you different lunch options.
Actually, it is pretty simple for an app to calculate a meeting point with the coordinates of the addresses, and you simplify it by using Google maps as a lot of locals are already registered. Otherwise, partnering with restaurants and bars could be a great mutual opportunity. But true, it doesn't need to be an app, it can actually be a feature of Google maps.
Anyways, it would be very cool to have something like that, especially if you are up to try new places and want to meet to a fair distance for everyone.