@ARTICLE\{IMM2011-05979, author = "J. E. Larsen and A. Stopczynski", title = "A Festival-wide Social Network using {2D} Barcodes, Mobile Phones and Situated Displays", year = "2011", month = "sep", keywords = "Social network, {2D} barcode, {RFID,} identification, mobile, smartphone, situated display, interaction, festival, large-scale event", pages = "14-30", journal = "International Journal of Mobile Human Computer Interaction", volume = "3", editor = "", number = "3", publisher = "{IGI} Global", url = "http://www2.compute.dtu.dk/pubdb/pubs/5979-full.html", abstract = "In this paper we report our experiences with an exploratory prototype festival-wide social network applying unique {2D} barcodes on wristbands and mobile phones to uniquely identify the festival participants. Experiments were carried out at the CO2PENHAGEN music festival in Denmark. We describe a set of social network applications involving participant profiles, a microblog and images shared on situated displays, and competitions created for the festival and our experiences from initial use of these. The pilot study included 73 participants each creating a unique profile. We found that our novel approach had potential to enable anyone at the festival to participate in the festival-wide social network, as participants did not need any special hardware or mobile client application to be involved. The {2D} barcodes was found to be a feasible low-cost approach for unique participant identification and social network interaction, and we discuss the implications for the design of future systems of this nature." }