My dad was extremely happy using Stumbleupon for years. It was about as high-pace low-quality you could get on the internet. I showed him sites like Reddit and elsewhere but he was very content with just Stumbling.
People like to blame FB/Twitter for low quality content without considering the huge market for that stuff. People aren't the ignorant sponges who can be pushed/pulled in whatever direction other people think is better for them, which is how everyone seems to treat the average internet user or voter. Much like trying to blame the whole "obesity crisis" on some evil capitalist food producers, without considering the natural evolution of the workplace, evolving urban environments, technology, chemistry, or just standard irrational human behaviour to be lazy and knowingly make bad choices.
I'm sure quite a few ivory tower intellectuals had their way they'd ban tabloids like National Enquirer and trashy reality TV like Big Brother. But I doubt that would suddenly make these demographics any better informed or better citizens.
We can try to push back against straight up lying, at least when it goes beyond entertainment, but demand will always find supply in the marketplace...