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.
Tennessee offers job to Alabama DC Jeremy Pruitt
Once an assistant at Hoover High School , Pruitt helped the Buccaneers win two straight state championships in 2004 and 2005. Pruitt would become Tennessee's fifth head coach since 2008, following Fulmer, Lane Kiffin , Derek Dooley and Butch Jones .
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.
Luke Shaw will get more chances at Manchester United, says Jose Mourinho
While his performance was full of running and explosive sprints, he carried this energy through much of an impressive second half. He's been publicly called out by his manager and had to deal with reports of United's interest in Danny Rose amongst others.
- 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.
Huawei P11 May Feature A Triple Lens Rear Camera
Devices with high MP lenses sometimes perform poorly in low-light conditions, so it's not always the best option. Blass claims that the phone will feature a triple lens camera, and feature 40 megapixel sensor on the back.