RyanMcGreal hit the nail on the head with his comment. I made a comment in a different thread about Apples subscription along the lines of how the Internet tends to route round things, which I think may apply here too.

Bear in mind the history of PGP (http://en.wikipedia.org/wiki/Pretty_Good_Privacy#Criminal_in...) as a prime example of this. When Egypt had it's Internet cut off, the Egyptians routed around it. They became the change they wanted to see and Mubarak had to step down.

Given that semi-automated astroturfing is a popular pastime for corporations, having the government astroturfing offers relatively little by way of difference except in certain circumstances where resources become an issue for corporations (e.g. identification). Much of what's proposed already exists elsewhere in the blackhat market anyway.

So how do you fight it? If you care enough about it, any way you can. Disinformation is as old as the hills. Exposing it is one way, discrediting the source is another, counterdisinformation yet another still. Not participating in places where known or suspected personas exist is probably best. For the truly organised group of today (and for the casual group of tomorrow) there's darknets and offline means of communication.