Is this relevant now with the spread of the Internet? As long as a government does not filter or censor the Internet, no single entity can control information and the news.
So maybe the Montesinos of the 21st century will revert to bribing (or coercing) those with, say, a high Klout score. The medium may be different, but the methods will remain the same....
That's kind of an important condition, isn't it? How many places is that really still true? How long will it last? Anyway, your "single entity" doesn't have to control all the information sources, just most of the ones people listen to.