WIRED: America’s Funniest Home Videos may have pioneered the YouTube concept, but as the site reaches the five-year mark, its audience size is no laughing matter. YouTube’s viewership now exceeds that of all three networks combined during their “primetime” evening time slot, with more than 2 billion views per day, Google announced Sunday. Granted, YouTube’s numbers come from worldwide views, while ABC, CBS and NBC broadcast their primetime channels within the United States. But this is a significant milestone nonetheless, and hints at an eventual tipping point when the internet could become the world’s dominant video-delivery system, Mark Cuban’s predictions aside. Google also trumpeted some other key stats: People upload over a day’s worth of video to YouTube every minute; the average user spends only 15 minutes a day on the site, which YouTube would like to increase in part by renting full-length films; and YouTube has broadcast live sports to more than 200 countries. MORE