Today, YouTube announced its most-watched music videos of 2017.
"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.
Here's a look at the YouTube videos that got the most attention in 2017.
2017 also saw some major new records broken in music, most notably by Luis Fonsi and Daddy Yankee's massive global hit. The show, called The Mask Singer, requires performers to wear elaborate masks to hide their identities.
Warren Moon requests leave of absence from Seahawks radio broadcast
In addition to his role as president of Sports 1 Marketing, Moon serves as a color commentator on the Seahawks radio network. The woman, 32-year-old Wendy Haskell, was hired as the 61-year-old Moon's executive assistant in July.
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. Both videos racked up more than one billion views each. Farmer went on to be crowned champion of the season when it finished in September.
But there's more work to be done yet, and so YouTube plans to grow its moderation team to 10,000 employees next year.
Not surprising, however, is that the list is dominated by Irish music - claiming the top four spots.
The pop queen's Super Bowl halftime performance, which in typical Gaga fashion was brimming with theatrics, was watched 3.8 million times the day following the game, according to YouTube. 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. Its machine learning algorithms have helped remove more than 150,000 videos from YouTube since June that depict violent extremism. She did not say how many people now monitor YouTube for offensive videos.
John Mayer Thanks Fans for the Love Following Emergency Appendectomy
Ticketholders can rest assured: tickets for these shows will be honored for the rescheduled dates. As such, the band's Tuesday night concert at New Orleans' Smoothie King Center was postponed .
- Ed Sheeran made the list twice.
Professor Robert Kelly's Skype interview with BBC News started just like any other video news clip.
Wojcicki said YouTube was taking a "new approach to advertising", with more manual curation, stricter criteria for videos eligible to show ads, and a greater number of ad reviewers.
Willie Taggart introduced as FSU's new football coach
The Ducks went 7-5 in Taggart's lone season in Eugene, an improvement of three wins over their down 2016 campaign. I was in awe when I had a chance to meet him. "I apologized (to everyone at Oregon ) before I left".