YouTube says that traffic to its mobile site grew 160 percent over the last year—and says that bringing ads to the mobile site will “immediately provide one of the largest audiences for a mobile ad campaign anywhere on the web.”

As a reader points out, the other metric YouTube provides is less impressive; the company says “tens of millions of videos” are now being viewed on the mobile site each day. When YouTube started testing one-and-a-half years ago, it said users were watching “hundreds of millions” of YouTube videos each month on their phones. Not clear how different those two stats are.

As for the web version, Google said last summer that it was now getting “well over a billion views a day.” Analysts have said that growth—as well as monetization efforts, like the new mobile ads—could lead to YouTube boosting Google’s bottom line for the first time this year.