When we last checked in on one of Sandvine's traffic studies, Netflix had just edged past BitTorrent as the largest source of internet traffic in North America while YouTube was still a small-timer. A year has made quite the difference. Netflix is up to 28.8 percent in a new study, while YouTube has moved up to second place with 13.1 percent and demands even more than ordinary web requests. Rivals like Hulu don't register in the top 10, and YouTube is by far the ruler of mobile with nearly 31 percent of smartphone traffic headed its way. Overall usage is moving up rapidly, no matter what kind of network the continent uses -- the typical North American chews up 659MB per month when mobile and a hefty 51GB through a landline. There's little reason to dispute worries of the impact on bandwidth-strained internet providers, although we suspect most would disagree with Sandvine on what's to be done. The company naturally sees the study as a chance for business with carriers wanting to curb usage or charge extra through its tools; a generation that grew up with internet access, however, would likely see it as a better excuse to roll out more capacity for all those streaming videos.