“S’up?” is a collaborative app which works similarly to an informal city guide made by the city residents and tourists. The concept is based on the popular expression:”Nobody knows a city better than the residents themselves.”. The idea is that the users themselves indicate issues and give some tips about the best things to do at the city. In addition to that they could also ask for help to solve softer issues at their neighborhood. It could also be used to check for advices about the user’s current location.