Mobile and situated crowdsourcing

During the past years, crowdsourcing has grown from a number of purpose-built initiatives, such as Wikipedia and Mechanical Turk, to a technique that today that today is used by corporations and academics alike for a plethora of different purposes. While online crowdsourcing is still the most commonly used way of gathering crowd contributions, people are increasingly engaged through mobile devices to capture, share and validate different kinds of data. Similarly, embedded ubiquitous technologies, such as public displays, have recently presented themselves as promising media to conduct crowdsourcing experiments. As computing systems become more intimately embedded in physical and social contexts, crowdsourcing can more easily take new forms by leveraging the capabilities of these technologies. This special issue is devoted to the recent developments and research outcomes addressing the different aspects of mobile and situated crowdsourcing.