Dive summary: 

• The fact that Google-owned YouTube serves over 1 billion monthly viewers is reason enough to take notice, but there are 15 other facts every marketer should know about the video sharing site. [see the full list at Digiday]
• 25% of Youtube views come from a mobile device.
• 46% of Youtube users are 24 years old or younger.
• Pre-roll ads over 30 seconds perform just as well as 30- or 15-seconds ads.

From the article: 

"In an age of paid, owned, and earned media, YouTube sits at the intersection of the three. Brands like Red Bull have distributed content to hundreds of millions of users through their owned channels on the platform, but the site also sells ads to all of the top 100 advertisers in the U.S. What’s more, it’s audience continues to grow. Its millions of videos are now watched by 1 billion users a month, globally, and over 150 million users in the U.S."