8. One or more computer-readable non-transitory storage media embodying software that is operable when executed to: access a first feature vector representing a video-content object corresponding to a node in a social graph of a social-networking system, wherein: the video-content object comprises frames and audio and is associated with text; the first feature vector is based on one or more of the frames of the video-content object; and the social graph comprises a plurality of nodes and edges connecting the nodes; access a second feature vector representing the video-content object, wherein the second feature vector is based on at least some of the text; access a third feature vector representing the video-content object, wherein the third feature vector is based on one or more portions of the audio; determine a fourth feature vector representing the video-content object, wherein the fourth feature vector is based on a combination of the first, second, and third feature vectors; and determine a context of the video-content object based on the fourth feature vector and social-graph information based at least in part on one or more nodes or edges connected to the node corresponding to the video-content object.
8. One or more computer-readable non-transitory storage media embodying software that is operable when executed to: access a first feature vector representing a video-content object corresponding to a node in a social graph of a social-networking system, wherein: the video-content object comprises frames and audio and is associated with text; the first feature vector is based on one or more of the frames of the video-content object; and the social graph comprises a plurality of nodes and edges connecting the nodes; access a second feature vector representing the video-content object, wherein the second feature vector is based on at least some of the text; access a third feature vector representing the video-content object, wherein the third feature vector is based on one or more portions of the audio; determine a fourth feature vector representing the video-content object, wherein the fourth feature vector is based on a combination of the first, second, and third feature vectors; and determine a context of the video-content object based on the fourth feature vector and social-graph information based at least in part on one or more nodes or edges connected to the node corresponding to the video-content object. 12. The media of claim 8 , wherein the software is further operable when executed to remove a second video-content object based on determining that the video-content object and the second video-content object are similar based on the feature vector for the video-content object and a feature vector for the second video-content object, wherein determining the context of the video-content object comprises determining that the video-content object is inappropriate.