This is a test -- ads on YouTube's mobile site

Over the past year, we’ve focused on creating and delivering a full-featured YouTube mobile user experience. We think we've made great strides in doing this, allowing you to access YouTube wherever you are, whenever you want it. YouTube for mobile continues to grow exponentially, and today, people watch hundreds of millions of YouTube videos every month on mobile devices.

You may have noticed that we started running a test of display ads on select pages of the YouTube mobile site in the U.S. and Japan. This is our first step in testing mobile advertising for YouTube -- it will give you a new way to interact with content on the go, while allowing us to learn how video viewers engage with mobile advertising. Our test advertisers will also have an additional branding tool at their disposal and the opportunity to reach the millions of people who visit YouTube every day on their phones.

At YouTube, we are constantly testing new ways to deliver the kinds of ads that contribute to the user experience while making the most sense for advertisers, and we've learned a lot about what works for YouTube and what doesn't. We're excited to explore new approaches to mobile advertising, and will evaluate this test closely over the next several weeks to make sure we provide our community, our partners and advertisers with the most valuable and effective mobile experience possible.

Posted by Christine Tsai, Product Marketing Manager, YouTube