CrowdCafe is a mobile crowdsourcing platform, where people execute micro-tasks while semi-occupied contexts using a smartphone in exchange for a tangible reward
image! semi-occupied contexts ! limited in set of activities to perform! traveling by bus, train, standing in a queue! tangible reward! coffee, ice-cream, bus ticket! museum ticket, newspaper, wine bottle !
preselection (people did or did not some task)! ! user interface (link to raw html file)! ! input data (no data, .csv file or social network feed; quality control) Tasks creation!