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by w1ntermute 4903 days ago
Of course it's possible: http://netequalizernews.com/2010/10/26/enhance-your-isp-offe...

> To ensure better performance, my Internet provider keeps a local copy of the popular YouTube content (caching), and when I watch a trending video, they send me the stream from their local cache. However, if I request a video that’s not contained in their current cache, I’m sent over the broader Internet to the actual YouTube content servers.

I have no doubt that the vast majority of American ISPs have cached Gangnam Style. In the US at least, Google/YouTube likely assists in this process.