The fact is simple, YouTube is a social network—and you need to plan your approach to YouTube accordingly. How can I say so? YouTube says so and a bunch of other people say so. So let's go further and deconstruct this concept.
What makes a social network? Friends, comments, followers, subscriptions—these are all part of the social network experience, and they are also a part of YouTube.
More questions about YouTube answered at http://www.21QuestionsAboutYouTube.com http://www.youtube.com/watch?v=ZgyQmvbKRi4