From FierceCable: Nielsen measures local viewing based on 210 DMA regions across the U.S. and will use its Digital in TV Ratings (DTVR) to include YouTube TV.

Despite the constantly changing social media landscape, brands are still choosing Youtube over facebook for their main video hosting platform according to this article from Digiday. 

Adele’s video for “Hello” broke the one BILLION views mark in just 88 days. That’s a full 71 days faster than the previous record holder, “Gangnam Style”. “Gangnam Style” is still the only video (for now) with over TWO billion views.