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As a meme , the video was replicated by many people , using the same concept , and this rapidly led to it becoming viral in early February 2013 , with thousands of " Harlem Shake " videos being made and uploaded to YouTube every day at the height of its popularity .
 Harlem, YouTube
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Harlem, YouTube