Social centers (or social centres) are community spaces. They are buildings which are used for a range of disparate activities, which can be linked only by being not-for-profit. They might be organizing centers for local activities or they might provide support networks for minority groups such as prisoners and refugees. Often they provide a base for initiatives such as cafes, free shops, public computer labs, graffiti murals, legal collectives and free housing for travellers. The services are determined by both the needs of the community in which the social center is based and the skills which the participants have to offer.