Media are modulators of power. Why is this maxim so important when thinking abou

Media are modulators of power.
Why is this maxim so important when thinking about media histories? (Choose three media technologies that we have discussed this semester. )
How did each technology create systems of power? What were the cultural and social implications of those systems?
1,000-2,000 word 
Answers should engage these questions at the conceptual level and use specific examples from the media histories we have covered this semester to support your arguments.