It can be a good thing. Imagine Donald Trump saying that Obama wasn't born in USA. Obama or anyone could create an annotation with a witty response on that part

It can be a good thing. Imagine Donald Trump saying that Obama wasn't born in USA. Obama or anyone could create an annotation with a witty response on that particular sentence or video time frame and a link to the PDF with his birth certificate. Trump could also defend himself inside the "fake news" by commenting directly and exposing the malicious attempt of manipulation.