ビデオサイトは多様なニッチが優勢–YouTubeは本数ばかり多く視聴時間は短い
YouTubeがいくら、月間130億本のビデオストリーム、本数のシェアでは40%の高率を誇っていても、しかし視聴時間のシェアでは、昨年のYouTubeは全視聴時間のわずかに26%を占めただけだった。つまりYouTubeの場合は、本数は多くてもほとんど短いのばかりだから、こんな結果になるのも当然だ。しかし本当に意外なのは、上位25のいわゆる大手ビデオサイトのシェア合計よりも、それ以下の何百というマイナーなサイトの合計シェアのほうが大きいことだ（視聴時間シェアで）。つまり合衆国のネット上のビデオサイトはYouTubeなどによる寡占ではなく、その逆の零細多数分散だ。
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