Trump can block people on Twitter if he wants, administration says
Ars Technica 2017-08-14

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The administration of President Donald Trump is scoffing at a federal lawsuit by Twitter users who claim that their constitutional rights are being violated because the president has blocked them from his @realDonaldTrump Twitter handle.
"It would send the First Amendment deep into uncharted waters to hold that a president's choices about whom to follow, and whom to block, on Twitter—a privately run website that, as a central feature of its social-media platform, enables all users to block particular individuals from viewing posts—violate the Constitution." That's part of what Michael Baer, a Justice Department attorney, wrote to the New York federal judge overseeing the lawsuit Friday.
In addition, the Justice Department said the courts are powerless to tell Trump how he can manage his private Twitter handle, which has 35.8 million followers.