Re: Twitter is actually a Force for Good [for now]
No, it doesn't work that way. Look: let's assume that what you say is true, that there are things mainstream media actively keep hidden, and that these things can get published on Twitter.
You have to realize that there are also loads of bollocks on Twitter. Anyone can post anything, they can't all be real whistleblowers. There will be lunatics, trolls, and plain old people who are wrong; given how many users there are on Twitter, these would be by far the majority - the real whistleblowers can't possibly number in the millions, or even in the thousands.
On top of that, it's likely that at least a few of those who look genuine (whatever "look genuine" means) are actively posting propaganda, while pretending to be whistleblowers - I mean, if I wanted to keep the masses in the dark about stuff, that's one of the first things I would do. They'd be pretty damn good at it, too. They'd imitate the writing style of the real deal, and forge their own sources and references. Anyone with the clout to influence newspapers would find this quite trivial in comparison.
Given that situation, you don't really have any way to tell what's garbage and what isn't. Any time you trust something someone said on Twitter, it's a crap shoot whether they are telling the truth, or they are deranged, or they are trolling you, or they are wrong, or they are actively attempting to deceive you. And the odds are overwhelmingly against you.
Ultimately, if you distrust mainstream media, then rationally you also should distrust anything posted on open platforms, because it's at least as screwed up as mainstream media, and probably more.