This book constitutes the thoroughly refereed post-conference proceedings of the First International Workshop on Citizen Sensor Networks, CitiSens 2012, in Montpellier, France, on August 27, 2012. The accepted papers deal with topics like crowdsourcing, smart cities, multi-agent systems, privacy in social networks, data anonymity or smart sensors.

Citizens Sensor Networks.- Crowdsourcing for Industrial Problems.- Multiagent Co-ordination of Wireless Sensor Networks.- On the Protection of Social Network-Extracted Categorical Microdata.- The TweetBeat of the City: Microblogging Used for Discovering Behavioural Patterns during the MWC2012.- A Platform for Citizen Sensing in Sentient Cities.- Incorporating Mobility Patterns in Pedestrian Quantity Estimation and Sensor Placement.- Users as Smart Sensors: A Mobile Platform for Sensing Public Transport Incidents.- Crowdsourcing for Industrial Problems.- Multiagent Co-ordination of Wireless Sensor Networks.- On the Protection of Social Network-Extracted Categorical Microdata.- The TweetBeat of the City: Microblogging Used for Discovering Behavioural Patterns during the MWC2012.- A Platform for Citizen Sensing in Sentient Cities.- Incorporating Mobility Patterns in Pedestrian Quantity Estimation and Sensor Placement.- Users as Smart Sensors: A Mobile Platform for Sensing Public Transport Incidents. 

This book constitutes the thoroughly refereed post-conference proceedings of the First International Workshop on Citizen Sensor Networks, CitiSens 2012, in Montpellier, France, on August 27, 2012. The 7 revised full papers presented together with 1 keynote lectures were carefully reviewed and selected from 16 submissions. The accepted papers deal with topics like crowdsourcing, smart cities, multi-agent systems, privacy in social networks, data anonymity or smart sensors.