The author somehow misses the fact that governments has been engaging small number of opinionmaking professionals (journalists, advertisers, writers, celebs etc.) to create the feeling of majority support since the time when majority opinion became important. State controlled TV, and radio existed for decades, and they always talk on behalf of "majority" which supports gov't.
And in a more democratic country a small number of people who do news, or control social platforms can do the same out of solidarity, shared economic interests, or just because.
To say that thousands generated Twitter accounts are more powerful than Twitter itself, or even more than TV channels used to be just 30 years ago is obviuos exaggeration.
We have been living with this for quite a long time already, and while it's often works, one can't do it for a long time, because there will be inevitable cultural response: people stop believing, or just paying attention - examples are all over the recent history.