I was think ing about making an app which will be called the face search engine , that is given a portrait, it will go and search the web and show you pics of people who look like you .
So this might be a very costly thing to do but not the worst possible application I believe. But people who look alike could have groups of their own . Their could be new communities etc .
Don’t know whether the idea is feasible but lets see, We are thinking about the logistics of this project