A method of social broadcasting is disclosed. A metadata is generated indicating items of content expected to be included in a broadcast and for each item of content a manner in which the item of content is to be included in the broadcast. The metadata is provided and at least a subset of said items of content to a broadcast platform in one or more network communications sent to the broadcast platform via a network interface. A method of social broadcasting is disclosed. A metadata is received via a server interface indicating items of content expected to be included in a broadcast and for each item of content a manner in which the item of content is to be included in the broadcast. At least a subset of said items of content is stored in a media cache. Said items of content are used to assemble in the manner indicated by said metadata, and to provide as output for broadcast to the station interface, a broadcast stream, including by responding dynamically to subsequently received metadata indicating a change in one or both of (1) said items of content expected to be included in a broadcast and (2) the manner in which one or more of said items of content is or are to be included in the broadcast.