7. The method of claim 1 , wherein selecting the subset of the set of television program identifiers most closely related to the selected metadata tag further comprises generating a distance value, for each node of the plurality of nodes representing a television program identifier, based on a degree of separation between the node and a node representing the selected metadata tag in the graph data structure.
7. The method of claim 1 , wherein selecting the subset of the set of television program identifiers most closely related to the selected metadata tag further comprises generating a distance value, for each node of the plurality of nodes representing a television program identifier, based on a degree of separation between the node and a node representing the selected metadata tag in the graph data structure. 8. The method of claim 7 , wherein selecting the subset of the set of television program identifiers most closely related to the selected metadata tag further comprises identifying nodes with distance values greater than a predetermined threshold value.