All being reasonably sensible and being aware and in agreement of the idea that big corporations indeed influence public and political opinions, directly or ind

All being reasonably sensible and being aware and in agreement of the idea that big corporations indeed influence public and political opinions, directly or indirectly, what can someone do about it? Chomsky always says, "Organize!". Organization requires mass involvement. Mass involvement comes when there are masses with same opinions. How would one go about finding masses with same opinions when the mainstream platforms won't allow such opinions to be posted in the first place that they oppose?