Just how big is YouTube? At an event for advertisers in New York City this evening, YouTube CEO Susan Wojcicki said that YouTube is now reaching more people in the oh-so-coveted 18-49 year old age demographic on mobile than any TV network is period.

That’s a big followup from the stat YouTube announced last year, that it was beating out TV networks on reach in general — not with mobile alone. “Let me tell you from running a service”, Wojcicki said, “that is not easy to achieve”.

That said, it’s worth remembering that this is a measure of how many people YouTube is reaching, not necessarily hours watched, and YouTube has the advantage of being a global service. Though Wojcicki didn’t share hard numbers, she said that the number of people visiting YouTube is up 40 percent from last year.

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