Hulu and YouTube have not revealed how many people have subscribed for the live TV services that they launched in the spring as a counter to cable TV.
Subscribers can stream channels live on laptops, smartphones and elsewhere. They can also record shows digitally or watch them on demand. Both services cost nearly $40 a month.
Media companies base the amount they charge advertisers on the number of people who are watching at a particular time, and want to insure that online viewers are also counted as more people shift to using online streaming services.