Walter Kirn has personally and repeatedly seen the corruption of Twitter. An excerpt from his article at Common Sense:

My forebodings were confirmed with the launch of the “Russiagate” investigation. I doubted its premises highly from its inception, but when I voiced these doubts on Twitter curious things occurred. My tweets on the subject, my followers reported, often were invisible to them, and yet, to my eye, they drew engagement. Strange. The Twitter users who “liked” my tweets tended to have tiny followings, I found, and they didn’t follow me. Their profile photos were often stock images. I ran an experiment one night and sent out a tweet of a controversial nature which I expected would be suppressed or screwed with, and then, when it was, I used screenshots of the mischief to prove to my followers that Twitter was dishonest.

I looked crazy. Concerned DMs arrived. One accused me of grandiosity for thinking I mattered enough to provoke intervention from on high. Innocence about Twitter still prevailed then; its cheerful bluebird logo still charmed the public mind. We had yet to learn, as we finally did this week (in a manner which confirmed my worst suspicions) of the hidden but direct coordination between Twitter’s management and the government, including the Department of Homeland Security, to suppress and guide opinion on topics from war to public health. (“One could argue we’re in the business of critical infrastructure, and the most critical infrastructure is cognitive infrastructure,” one government official put it.)