This is what YouTube leader Susan Wojcicki thinks about Facebook

Susan WojcickiFortune Brainstorm Tech/Stuart IsettYouTube CEO Susan Wojcicki

Early Google employee and YouTube leader Susan Wojcicki has a simple thought when it comes to competition with Facebook: they’re doing their thing and we’re doing ours.

That said, she wasn’t afraid to diss her competitor just a wee little bit while on stage at the Fortune Brainstorm Tech conference in Aspen, Colorado, on Monday.

First of all, she wanted to make it clear that everyone jumping into online video is staring at a “huge market, any way you look at it.”

Americans spend over 4 hours a day watching TV (a stat that amazes Wojcicki, she said). The TV advertising business is about a $US150 billion market and the subscription business is $US250 billion, she said.

And that’s changing as the younger generation stops watching TV the old fashioned way, preferring internet streaming over live TV.

So the fact that Facebook and Twitter “see this is a big opportunity and are coming into market” is “not a surprise,” she says.

However if you think Facebook is beating YouTube, she begs to differ.

Facebook claims it serves 4 billion videos a day compared to YouTube’s vaguer, “hundreds of millions of hours of ‘watch time.'”

But Wojcicki says that ‘watch time’ is a better metric.

“Facebook views are different,” she says. “They come in in a feed on autoplay.”

YouTube’s 1 billion users are deliberately clicking to watch videos. “We want users to be engaged,” she said. And with the ‘watch time’ metric “we know users continued to watch it.”

Plus, she insists, despite how huge YouTube is already, “We see it accelerating. We have

over 1 billion users globally, ‘watching time’ year-over-year is growing at over 50%.”

That said, instead of focusing on how to beat Facebook’s video business, she’s focused on YouTube’s list of priorities.

Her top three priorities are “Mobile, mobile, mobile,” she says. “The majority of our views are on mobile. We want to make the user interface better, creation experience better, make it faster. Mobile is changing everything and it will change it more in future,” Wojcicki says.

NOW WATCH: How much sex you should be having in a healthy relationship

NOW WATCH: Tech Insider videos

Business Insider Emails & Alerts

Site highlights each day to your inbox.

Follow Business Insider Australia on Facebook, Twitter, LinkedIn, and Instagram.