What Drives Internet Traffic?

Mostly Netflix and Youtube.  Not surprising, being heavily used video resources.   While I am a litte surprised at this: " ... Meanwhile, peer-to-peer file sharing -- services like BitTorrent and eDonkey that use a peer-to-peer group distribution model -- is decreasing sharply as a percentage of traffic. For the first time ever, total traffic for those types of services has fallen below 10% in North America, considerably earlier than what Sandvine predicted.  ... "