Yes, perfect examples. Those all happened after the invention of the printing press and were fueled by newspapers and/or pamphlets, etc, to allow communication to flow much more quickly and efficiently.
There was a time when the printing press was regarded as as scary a technology as radio would be later, TV would be later, and social media is today.
The claim was newspapers and radio. While the printing press may have played a role I don't think it's an accurate characterization to say the Revolutionary War was caused by newspapers fueling outrage. The causation is actually more likely reversed. The pamphlets were a result of outrage.
There was a time when the printing press was regarded as as scary a technology as radio would be later, TV would be later, and social media is today.