A fiction writer and former Obama Administration strategist changed tactics of DC spin

Echo chambers — a media phenomena in which information, ideas, or allegations are amplified and reinforced by repetition — have been with us as long as there’s been party politics.
Before radio, television and the Internet, when printed newspapers issued news, the editors and news syndicates had monopoly power to embrace allies and destroy opponents. As Aled Jones noted in Powers of the Press, newspapers then “had been securely implanted into the cultural landscape as an essential reference point in the daily lives of millions of people”.
That changed with social media and journalism’s democratization.