I didn't notice how bad twitter actually was until I was away from it for a while. The constant noise of advertisements/manipulation feels to me like the hum of an AC, your brain filters it out after a while and you convince yourself it doesn't bother you, but only after it's turned off, do you realize how bad it actually was.
That depends on how you define "whole." There must be examples of people either unknowingly and wrongly invoking "Russian disinformation" or intentionally invoking it for whatever purposes but there is definitely actual "Russian disinformation" occurring. Disinformation from all sorts of sources. It's imperative to be discerning now, and to be discerning about how to be discerning.
People, in aggregate, appear to want to read "news stories" with little discrimination about the quality or accuracy of those stories. When consumers want a product without care for quality, the market optimizes for that. So you get free news that's worth what you paid for it.
The problem is that journalism product crowds out (and delegitimatizes, intentionally, as competition) honest advocacy.