The C3PO project promotes the development of a new kind of social networks called Spontaneous and Ephemeral Social Networks (SESNs), dedicated to cultural or sports events. SESNs rely on opportunistic networks formed dynamically by the mobile devices of event attendees. This paper presents the framework developed in the C3PO project to support opportunistic communication in such challenged networks. This framework exploits the different wireless interfaces of the mobile devices (e.g., Bluetooth, Wi-Fi and Wi-Fi Direct) to interconnect them so as to form an opportunistic network. Categories and Subject Descriptors C.2.1 [Computer-Communication Networks]: Network Architecture and Design—Store and forward networks Keywords Mobile Social Networking, Opportunistic Computing.