In this paper, we present a method for video category classification using only social metadata from websites
like YouTube. In place of content analysis, we utilize communicative and social contexts surrounding videos
as a means to determine a categorical genre, e.g. Comedy, Music. We hypothesize that video clips belonging
to different genre categories would have distinct signatures and patterns that are reflected in their collected
metadata. In particular, we define and describe social metadata as usage or action to aid in classification. We
trained a Naive Bayes classifier to predict categories from a sample of 1,740 YouTube videos representing the top
five genre categories. Using just a small number of the available metadata features, we compare the classifications
produced by our Naive Bayes classifier with those provided by the uploader of that particular video. Compared
to random predictions with the YouTube data (21% accurate), our classifier attained a mediocre 33% accuracy in
predicting video genres. However, we found that the accuracy of our classifier significantly improves by nominal
factoring of the explicit data features. By factoring the ratings of the videos in the dataset, the classifier was
able to accurately predict the genres of 75% of the videos. We argue that the patterns of social activity found in
the metadata are not just meaningful in their own right, but are indicative of the meaning of the shared video
content. The results presented by this project represents a first step in investigating the potential meaning and
significance of social metadata and its relation to the media experience.
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