YouTube is not only grabbing an ever-larger online audience. It's also attracting first-string Silicon Valley executives.

The video-sharing Web site, founded just 19 months ago, has hired

Yahoo!

(YHOO)

Treasurer Gideon Yu as its chief financial officer, according to a report Saturday in

The Wall Street Journal

.

The hiring shows YouTube is maturing and might begin pursuing deals or an IPO, the report noted.

YouTube's users now watch more than 100 million videos a day, making the start-up competitive in the online video arena against Internet goliaths like

Google

(GOOG) - Get Report

.

This isn't the first time YouTube has snatched an executive from Yahoo!, the report noted. Earlier this year, it hired Tony Nethercutt to build its ad sales team.