5. The system of claim 2 wherein the plurality of sparse graph data sources includes an ordered list of media object adjacency data derived from one or more authored media streams.
5. The system of claim 2 wherein the plurality of sparse graph data sources includes an ordered list of media object adjacency data derived from one or more authored media streams. 6. The system of claim 5 wherein the media object adjacency data is derived by monitoring a broadcast of the authored media streams, identifying the media objects in the authored media streams, and recording the adjacency data for each identified object in the authored media streams.