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‪For the past few years, young people’s use of online communication spaces has been accompanied by increasingly diversified and intrusive presence checks, such as the time of the last connection, whether or not a piece of content has been opened, or whether or not a reply is being written. The SnapMap, a product of the Snapchat application, is today the most obvious illustration of this surveillance logic, allowing young people to display their geographical position in real time. This empirical contribution, which is based on a qualitative methodology (27 semi-directive interviews), takes into account the appropriations, detour and stakes of this particularly chatty socio-technical device on the presence and activity, both online and offline, of adolescent peers. It emerges that if it can be used out of simple curiosity or to serve grouping or avoidance strategies, the SnapMap remains above all a revelation of truth in the case of strong friendships or sentimental relationships. It also appears to be a deeply codified space: voluntary disconnection from the tool leads to the need for a justification and the lack of control in sharing one’s location is socially sanctioned.‪