Technological developments or non-directional social movements with great impact?

Some discussions on the polarization of politics are pointing at least the little finger at changes in media and the arrival of social media. But that’s not a GQ thing. My question is about history. How did the world change with the arrival of the printing press? The first newspapers? The phone? Any political and/or social upheaval that can be linked to these and other otherwise neutral changes in how human interaction functions?

The printing press was definitely a factor in the Reformation. There even a wikipage on it: Propaganda during the Reformation