https://en.wikipedia.org/wiki/Manufacturing_Consent
See also Revolt of the Public, which explores the consequences of the internet breaking monopoly control over the flow of information. As you point out, it's the alternative channel that gave rise to unauthorized voices. What we're seeing play out is a fight between the dissenting public and the ruling elites. Removing dislikes is just the latest in a series of moves to reassert control over information.
https://www.amazon.com/Revolt-Public-Crisis-Authority-Millen...