“With this partnership, we can deliver more relevant messages to Roku consumers for products and services that interest them,”said Kern Schireson, Viacom executive vice president of data strategy and consumer intelligence. “Advertising experiences like this are more impactful for both consumers and marketers.”

In the U.S., Roku is the most-used box for streaming video, according to researcher Parks Associates. Last year, Roku users streamed 5.5 billion hours of content, the companies said Thursday.

From the article "Viacom To Target Ads On Roku Streaming Boxes" by Joan E. Solsman.