I also have a very good experience on Twitter, being careful only to tweet constructive things, and curating my feed. (I'm interested in political news, and find that following only Kyle Griffin gives me all the signal and none of the noise).
That said, though I can tune my personal experiences in these ways, I feel like I'm pissing into the wind. All of the digital content business is relentlessly optimizing for clicks and engagement at the expense of everything else, so I think it's increasingly difficult to filter for quality. I try to spend more time with print, but I find it hard to resist the immediacy of digital.