Fernando, self censorship is everywhere, because the medias have a lot of particular interests. George Orwell wrote an article more than 50 years ago as a preface for his book Rebelión en la granja (sorry I don't remember the original tittle). It's a great book, as all the editors thought, but noone wanted to publish it because it was critic with the URSS, and the URSS was a friend country against the nazi Germany, and the crimes of Stalin were not so bad (this is an example of self censorship), of course I could look for other examples of today if you want.