After taking the lead at YouTube, she told Kafka in an earlier interview, she focused on understanding the ecosystem of content creators on the site, and better promoting these creators so they can make money. One of these creators is, presumably, PewDiePie, who recently was rumored to be considering ditching YouTube as his distribution network. (If PewDiePie doesn't mean anything to you, that's okay; I had to look him up as well. But the Swedish video game vlogger has over 31 million subscribers to his YouTube channel, which makes him a priority in YouTube's content-partner-relationship goals.)  Kafka asked Wojcicki how YouTube would handle it if a creator like PewDiePie were to leave YouTube at the end of the year. "Would you change the ad split, or write a check, [basically] 'Don't go, stay'?"  Wojcicki said it "depends on the creator," but underscored the strategy of promoting and investing in content partners. "Every creator's going to try to be a little bit different … and we certainly talk to all of our creators."  "We're always watching, always trying to innovate," she continued. "It's similar to the ad market in a lot of ways: There are always new ad platforms coming out, but at the end of the day people say, I'm going to go to the one that generates the most revenue for me."  Still, the most compelling insight from Wojcicki was around the potential subscription service for YouTube content. Wojcicki is no stranger to the ad business: Prior to YouTube, she led Google's advertising and analytics team, overseeing products like AdSense, AdWords and DoubleClick. (She was also a very early employee of Google, and famously let founders Larry and Sergey run a fledgling Google out of her garage back in the day).  "We've been thinking about other ways it might make sense for us [at YouTube]. We're early in that process, but if you look at media over time, most of them have both ads and subscription services," she said.  Read MoreHere's how Facebook will keep growing  As Wojcicki said earlier in the interview, Google attracts more than a billion visitors per month, and an increasing number of them are coming from mobile. Google doesn't break out YouTube's financials, but eMarketer has said the site generated $5.6 billion in ad revenue last year.  One nugget that Wojcicki shared was that 50 percent of YouTube views are now coming from mobile devices. She also said that the site is growing 50 percent each year in terms of watch time (although, she conceded that YouTube watch time still doesn't come close to the average amount of time consumers watch TV each day).  When it came to questions around other subscription services — specifically, YouTube's long-promised music subscription service — Wojcicki was once again noncommittal, and wouldn't say whether it would launch this year.  "We're working on it," she said. "You'll be one of the first to know!"
YouTube is in the early stages of exploring new subscription services, YouTube CEO Susan Wojcicki told Re/code at Monday's Code/Mobile conference.