Sharing photos and recommendations in the city streets

Sharing events with others is an important part of many enjoyable experiences. While most existing co-presence systems focus on work tasks, in this paper we describe a lightweight mobile system designed for sharing leisure. This system allows city visitors to share their experiences with others both far and near, through tablet computers which share photographs, voice and locations. A collaborative filtering algorithm uses historical data of previous visits to recommend photos, web pages and places to visitors. In an extensive user trial we explored how these resources were used to collaborate around a physical place.