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This study, by looking at street communication operations (including flash mobs), aims to highlight the encounter between technique (technological means) and humanity (supposedly in search of interactions), and between the physical body (flesh and physical contact) and the virtual self (digital communities). The analysis of these communication devices, be they online or offline, inviting the townsperson to live in the urban space in an immersive and ephemeral way, reveals mutual extensions between urban and virtual spaces, extensions that are symptomatic of a double process of hyperpublicitization and depublicitization. Communication strategies using cities as a media form create a festive and spectacular environment that is playful and creative, and make the involvement of the (collaborating) public imperative. However, the social reality remains to be investigated, as do the ideological foundations of a collaboration studied here and praised by communication professionals.