Do third-party providers bear responsibility for content?

Third-party content is the driving force of the Internet. While you can get media off of official websites and the like, your go-to place to find media is likely on a third-party host. Think places like YouTube, Vimeo or even Google Image Search. When you're looking for high-res photos of Justin Bieber or Lady Gaga live videos, chances are you aren't hitting up the official site, but rather one of these third-party providers.  The responsibility of third-party providers to...