Fueled by growing professional content support, YouTube's (GOOG) U.S. monthly viewing reached...

|By:, SA News Editor

Fueled by growing professional content support, YouTube's (GOOG) U.S. monthly viewing reached 463 minutes/user in May, comScore estimates - up 49% Y/Y and 11% from February. Meanwhile, Yahoo's (YHOO) minutes/viewer nearly doubled Y/Y to 77. Facebook's (FB) rose 24% to 24, but unique viewers fell 8% to 44.3M, less than 1/3 of YouTube's. The figures are proof Facebook is struggling to turn its dominant position in online photo sharing into a top position in online video.