That tops the record 42.6 billion videos viewed in October, according to figures from the online ranking service comScore.
For December, comScore reported that Google sites (YouTube, mostly) served 21.9 billion videos to U.S. viewers. YouTube/Google viewers watched an average of about 8 hours of video. About 157.2 million unique viewers found their way to YouTube/Google in the holiday month.
Second in uniques was Vevo, the music video site, with 53.6 million. Then came Yahoo (53.3 million uniques), Viacom (45.7 million) and Facebook (42.0 million). The rest of the top 10 were, in order, Microsoft, AOL, Hulu, Amazon sites and Turner Digital.
Hulu had the second highest figure for average viewing, 3 hours. TV rerun specialist Hulu also posted the highest number of video ad impressions, 1.5 billion.
Time spent watching video ads totaled more than 3 billion minutes during December, with spots reaching 51 percent of the U.S. population an average of 46 times.