Early this year, the most popular YouTube video of all time — a 2007 clip of a British toddler gleefully biting the finger of his older brother — was supplanted by a brash newcomer.
The upstart was Lady Gaga's slithering, sci-fi-themed music video for her hit single "Bad Romance."
The shift was symbolic: YouTube, a subsidiary of the search giant Google, is growing up. Once known primarily for skateboard-riding cats, dancing geeks and a variety of cute-baby high jinks, YouTube now features a smorgasbord of more professional video that is drawing ever larger and more engaged audiences.
On Monday, YouTube will celebrate its fifth birthday by announcing it has passed two billion video views a day; YouTube said it reached the one billion mark in October.
New York Times