Nielsen Digital Ad Ratings Begin to Roll Out for YouTube CTV YouTube and Nielsen roll out new ad measurements as YouTube CTV viewership continues to increase. Here's what you need to know. SEJ STAFF Amy BishopOwner & Marketing Consultant at Cultivative, LLC Bio 196 In 2020, more people than ever streamed YouTube on connected TVs (CTV). This is driven in part by people spending more time at home, resulting in more folks choosing to watch YouTube primarily on the TV screen. In December 2020, a quarter of logged-in YouTube CTV viewers watched content almost exclusively (more than 90%) on the TV screen, according to internal YouTube data.