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Google is searching for new ways to fight spammy query results.
The company is seeking to patent a method for identifying abusive user accounts "based on playlists." This system, which would likely be built into YouTube, calculates a "playlist score" based on features associated with a user's playlist. A playlist's features include its content, view count, "quality score," and the activity level of the user that created it. This system also calculates a "channel score" based on the user's average playlist score.
Source Fool.com