Tubefilter: Katy Perry’s Four-Day YouTube Live Stream Amassed 49 Million Views Worldwide

Tubefilter: Katy Perry’s Four-Day YouTube Live Stream Amassed 49 Million Views Worldwide. “In something of an unprecedented move for a celebrity of her caliber, Katy Perry took YouTube by storm last weekend when she announced that she’d be streaming live from a Big Brother-style house for four nonstop days in celebration of her new album, Witness.”