YouTube experiments with a new search results page that lets you refine results by selecting related tags. For example, if you search for [race car], YouTube shows a list of popular tags related to your query: #autos & vehicles, #indycar, #cars, #wreck, #car crashes etc. YouTube also shows the list of tags for each search result.
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If you click on one of the tags, you'll restrict the list of search results to videos that have a certain tag.
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YouTube doesn't use only user-defined tags, some of the tags are video properties (#hd, #fresh), tags used in comments (#omg, #lol, #wtf, #ftw, #fail, #cute), usernames.
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