comScore's Video Metrix service indicates that 184 million U.S. Internet users watched online video content in October for an average of 21.1 hours per viewer. The total U.S. Internet audience viewed 42.6 billion videos, representing an all-time high.Google Sites, driven primarily by video viewing at YouTube, ranked as the top online video content property in October with 161 million unique viewers and reached a record high of 20.9 billion videos viewed. Facebook ranked second with 59.8 million viewers, followed by VEVO with 57 million, Microsoft Sites with 49.1 million and Viacom Digital with 48.2 million. More than 42 billion videos were viewed during the month, with the average viewer watching a record 21.1 hours. Google Sites demonstrated the highest engagement with 7.1 hours per viewer.