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In this paper, the authors take advantage of the user behavior of re-questing videos from the related list provided by YouTube and the user behavior of requesting videos from the top of this related list to improve the performance of YouTube's caches. They recommend a related list reordering approach which modifies the order of the videos shown on the related list based on the content in the cache. The main goal of their reordering approach is to push the contents already in the cache to the top of the related list and push non-cached contents towards the bottom, which increases the likelihood that the already cached content will be chosen by the viewer.
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