Online video attracts a significant audience, with 1 in 5 or more American adults watching a TV show online (23%), user-generated content (UGC – 31%), or originally produced online video (OPOV – 19%) on at least a monthly basis, per results from an IAB study [pdf] conducted by GfK. But who are these viewers? The study profiles the audience of each online video type, finding that they each skew male, but more so among OPOV viewers. Viewers of original online content also skew older than those who watch TV shows online.