An independent test in 2009 uploaded multiple versions of the same song to YouTube and concluded that while the system was "surprisingly resilient" in finding copyright violations in the audio tracks of videos, it was not infallible. In December 2012, two billion views were removed from the view counts of https://www.linkedin.com/feed/update/urn:li:share:7356320248985194496/?actorCompanyId=77283885