YouTube is a social network?

These days i was searching some cool social networking sites because I love to join new social networks. In Google I search for social networking sites and found two websites which says YouTube is a social networking site? These are the sites:
http://ift.tt/1HSR2dm
http://ift.tt/29K5skQ
But according to the Wikpedia List of social networking websites, YouTube is not in the list?
Please anyone tell me is that...

YouTube is a social network?

from Social Networks http://ift.tt/29IEdKM
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