The purpose of this project concerns the investigation, determination and implementation of a common Enterprise Architecture, which can cover the particular needs of the most (if not of all) the different forms of digital cities. OSWINDS team has developed Social Data Observer as a platform which offers services to citizens and city visitors in terms of useful/interesting information provision at a given city context. Such information was derived automatically by the analysis of real-time social network activities within the city limits. In collaboration with the technological Institute of Larissa under the Actions for the research activity of the Technical Education Institutes