The Guardian published the article Revealed: US spy operation that manipulates social media with a dateline of Thursday 17 March 2011 09.19 EDT.
Military’s ‘sock puppet’ software creates fake online identities to spread pro-American propaganda.
This article is over six years old. Remarkably, this indicates that the USA was developing a capability that they now disingenuously accuse Russia of using. One way to figure out what to accuse your enemy of doing is to pick the worst thing you have done yourself and accuse the enemy of doing it.
I can only imagine that our government has developed techniques of countering this type of weapon. Their only stumbling block is to convince the USA citizens that in this one tiny little aspect, we need to put constraints on the freedom of our press. They are evidently working at this countermeasure, and succeeding.