It can be defeated by talking to people about things. If you are known to be an expert in topic X, and you are saying something different to what the media says about topic X (and which makes more sense), people (who know you and your reputation) are inclined to believe you over the media.

This only has a local impact, but global is made of local.

I do this as much as I can. Between chatrooms and local meets, I spend a significant portion of my time attempting to politely dispel misinformation.

It's exhausting, but it's worth it.

I want to organise with other people that do this, but I'm not sure how to do that. It feels like our efforts would be multiplied if we started to publish or otherwise spread information.