Casastristes.org explores housing problems in Spain. Its objective is to serve as an information and resources exchange platform in line with the Web 2.0 philosophy, through the creation of a reliable public database of empty houses in Spain. By providing data visualizations and a list of references on the website, the project also aims to offer resources likely to help clarify ambiguous concepts and strengthen the network of citizens, associations, collectives, etc. concerned about housing and on the lookout for a a way to communicate with each other, become visible, and make proposals.