Today, YouTube is the largest user-driven video con-tent provider in the world; it has become a major plat-form for disseminating multimedia information. A ma-jor contribution to its success comes from the user-to-user social experience that differentiates it from tradi-tional content broadcasters. This work examines the so-cial network aspect of YouTube by measuring the full-scale YouTube subscription graph, comment graph, and video content corpus. We find YouTube to deviate sig-nificantly from network characteristics that mark tradi-tional online social networks, such as homophily, re-ciprocative linking, and assortativity. However, compar-ing to reported characteristics of another content-driven online social network, Twitter, YouTube is remarkably similar. Examining the social and content facets of user popularity, we find a stronger correlation between a user's social popularity and his/her most popular con-tent as opposed to typical content popularity. Finally, we demonstrate an application of our measurements for classifying YouTube Partners, who are selected users that share YouTube's advertisement revenue. Results are motivating despite the highly imbalanced nature of the classification problem.
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