May I point you to two pieces I wrote, about organised efforts to hack the hack of this attention economy in the political context? It is different from old examples of propaganda or political communications in that it is partly attempting to leverage the phenomena you describe here, making them even more pernicious.

Micro-targeting of low information voters:

Microtargeting of low-information voters

The (dis)information mercenaries controlling Trump’s databases:

The (dis)information mercenaries now controlling Trump’s databases