10. A computer-implemented method executed by one or more processors of a social video search system, the method comprising: obtaining, by the one or more processors, social context information about interactions of a plurality of users from a social graph, the social context information including social video content sources; generating, by the one or more processors and based on the social context information, social attachment information, the social attachment information for generation of annotations that indicate associations with social video content and a relation to one or more of the plurality of users; and storing, by the one or more processors, the social attachment information in association with a video search index.
16. The method of claim 10 wherein the social context information includes information about timing of when at least one of the plurality of users interacted with one of the video content sources.