Again, copyright is all about <i>permission</i>.  Copying is just fine if someone has permission.<p>And who is the only person who has any idea who has given whom permission to do what?  Well, that would be the only person who can give that permission:  the copyright holder and their agents.<p>Note that this is even the case for identical items.  Just because one person wasn&#x27;t authorized to post a video to Facebook doesn&#x27;t mean that someone else was not.<p>I do not have an account on Facebook, so I have no idea what video sharing there is like.  Maybe it would make sense for them to do something, but the law at present does not obligate them to do any such thing.  Quite the contrary:  they&#x27;re not responsible for their users, other than to respond to DMCA complaints.<p>If you&#x27;re surprised by a mere hundred or so notices on a site of that size, I shudder to think what you&#x27;d say if you knew the true scope of the notices received by, say, Google search.  They get 10 times as many <i>per minute</i>.<p><a href="https:&#x2F;&#x2F;www.google.com&#x2F;transparencyreport&#x2F;removals&#x2F;copyright&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.google.com&#x2F;transparencyreport&#x2F;removals&#x2F;copyright...</a><p>~66M URLs removed this month &#x2F; 30 days * 24 hours * 60 minutes