The man in the mask sings "Until We Will Become Dust", which starts out as a ballad and eventually breaks into a rap.
"Some bad actors are exploiting our openness to mislead, manipulate, harass or even harm", Wojcicki said, adding that YouTube's trust and safety teams have reviewed almost 2 million videos for violent extremist content over the past six months.
Wojcicki said the company will apply lessons learned from combating violent and extremist videos to other "problematic" videos.
The America's Got Talent judging panel was so impressed by Darci Lynne Farmer's ventriloquist routine that they sent her straight to the live shows by pressing the coveted Golden Buzzer.
Astronomers Find the Earliest Supermassive Black Hole Ever Discovered
From this, they inferred that stars must have begun turning on during this time, 690 million years after the Big Bang. Astronomers have found the monster black hole, almost as old as the universe itself, chewing through clouds.
It's that time again, to jump into the way-back machine for #YouTube Rewind - YouTube's annual look back at the year that was.
- Lady Gaga's Super Bowl LI halftime performance. Some material, like images of animal abuse, are acceptable on the site, likely because they might be posted to draw attention to the issue, but others, like a comment that reads, "Someone shoot Trump", are a no-no. It's basically years of science and social studies classes compressed into 20 minutes and translated for the internet era.
This mini-film about a boy who follows his heart is the first animated short to make the list since 2011. It has been viewed nearly 1.1 billion times.
Justin Bieber set new records this year - his remix of Despacito, along with his appearance on DJ Khaled's I'm The One mean that the Biebs can now lay claim to 4 videos that have broken the one billion view threshold. No surprise here: "Despacito" took the crown.