Internet streaming services and social networks have drastically changed how people discover and consume music. Existing streaming services allow users to listen to music available on a centrally controlled web infrastructure. However, recent trends, e.g. large, inexpensive home storage devices and always on, high-speed broadband connectivity, provide the opportunity for users to collaboratively share their music collections directly, without the intervention of a service provider. In this paper we present FStream, a distributed, social music streaming service. Users contribute to the system by hosting at home a FStream-Box which enables them to have access to their music collection everywhere and at any time. In addition, they can share their collection with friends, discover new tracks thanks to a recommendation system and search for specific tracks in the whole network without using a central entity. FStream provides a fine grained sharing policy allowing the user to have full control over the way she shares her music and manage resource allocation to address traffic spikes and content availability.