13. A computer-executed method for mapping social content items to time-based media events, comprising: accessing from a social networking system a plurality of social media content items authored by users of the social networking system; aligning a plurality of metadata instances to segments of time-based media corresponding to events in the time-based media to form annotated events; and mapping to the annotated events the social media content items relevant to the annotated events.
15. The computer-executed method of claim 13 , wherein mapping to the annotated events a plurality of social media content items relevant to the annotated events further comprises: extracting social media features from the plurality of social media content items; extracting event features from the annotated events; and mapping the annotated events to the plurality of social media content items based on a relationship between the event features and social media features.