Facebook is practically synonymous with explosive growth—with one notable exception. An examination of comScore’s U.S. online-video rankings from 2010 reveals the red-hot social network has mysteriously nosedived by nearly 30 percent over five consecutive months after topping everyone but Google (NSDQ: GOOG) as early as last August (see chart after the jump).
In December, Comscore (NSDQ: SCOR) measured 41.1 million unique visitors for Facebook videos, good for sixth among all ranked sites. It’s a steep comedown from August, when Facebook registered 58.5 million. The website has also registered steady declines in other comScore video metrics like the number of video sessions and minutes per viewer.