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We present a mobile crowdsourcing study to capture and examine the nightlife patterns of two youth populations in Switzerland. Our contributions are three fold. First, we developed a smartphone application to capture data on places, social context and nightlife activities, and to record mobile videos capturing the ambiance of places. Second, we conducted an "in-the-wild" study with more than 200 participants over a period of three months in two Swiss cities, resulting in a total of 1,394 unique place visits and 843 videos that spread across place categories (including personal homes and public parks), social and ambiance variables. Finally, we investigated the use of automatic ambiance features to estimate the loudness and brightness of places at scale, and found that while features are reliable with respect to video content, videos do not always reflect the place ambiance reported by people in-situ. We believe that the developed methodology provides an opportunity to understand the physical mobility, activities, and social context of youth as they experience different aspects of nightlife.

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In the latest discussions of children and young people's new geographies of leisure and pleasure, one controversial issue has been how digital technologies co-produce and reconfigure young people's everyday worlds. This article draws on semi-structured interviews with 40 young people who regularly use social networking technologies in their nightlife experiences in Zurich and Lausanne, two nightlife hubs in Switzerland. Informed by Danah Boyd's concepts of 'collapsing contexts' and 'imagined audiences', this article enables a critical engagement with young people's emerging understanding of their nightlife contexts, which are increasingly permeated by networking technologies. I show how social networking spaces facilitate the coming together, or collapse, of various social contexts which induce young people to imagine multiple audiences, including authority figures, in their nightlife practices. These collapsing contexts and imagined audiences, I argue, present new perspectives on debates about control and surveillance in young people's contemporary urban nightlife.