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To quote John Gruber's commentary, related to the recent appeals court ruling whereby Trump cannot block people on Twitter:

With the absurd number of replies he gets with each tweet — thousands, if not tens of thousands — I can’t see why he even bothers blocking people. But I like to think he’s actually sitting there, wasting time each day poking buttons in the Twitter app, angrily blocking people.

Is there documented evidence that Trump has actually been taking the time to actively block people on Twitter since he is President of the United States?

If so, is there any evidence that suggests that is Trump doing so personally or, on the contrary, that this is being done by aids?

It appears that Trump is indeed personally responsible for blocking his critics on Twitter, as opposed to a staffer or aide. This came up in oral arguments this past March concerning the continuing suit brought against Trump by several people who had been blocked by the president. Insider.com reports that the disclosure came from a attorney for the Department of Justice:

[W]hile making the case for Trump during oral arguments before a three-judge panel, Justice Department attorney Jennifer Utrecht disclosed that the president — on his own — is wholly responsible for blocking users with the @realDonaldTrump Twitter account.

. . .

Katie Fallow, a senior staff attorney at the Knight First Amendment Institute, told INSIDER that the involved plaintiffs have expressed shock that the president personally went out of his way to block them.

While the government's attorney acknowledged in yesterday's arguments that the president does operate his Twitter as an official account, she said that he blocks people as a private person and on his own personal whim.

The phrase "on his own personal whim" could, incidentally, imply that not only does Trump block people personally, he does not even consult staffers as to the best course of action, let alone leave matters to them to handle.