It might be too soon to declare it unstoppable. After the invention of the printing press, people might have thought libel was unstoppable, since anyone could p

It might be too soon to declare it unstoppable. After the invention of the printing press, people might have thought libel was unstoppable, since anyone could print up and distribute handbills with false accusations. But libel became legally actionable in England in the early 1600s. That didn't reduce the incidence libel to zero, but it got it under control.