8. The computer system of claim 7 , wherein responsive to determining that a selected video from the plurality of videos has been previously played back to the user, selecting another video to include in the personal content stream.
8. The computer system of claim 7 , wherein responsive to determining that a selected video from the plurality of videos has been previously played back to the user, selecting another video to include in the personal content stream. 10. The computer system of claim 8 , wherein selecting another video comprises selecting a video associated with a stream topic in the set of stream topics that is different from a stream topic associated with the previously played video.