The president should be able to block you on Twitter, just like anyone else with a Twitter account. The federal judge who held that the president violated the First Amendment by blocking certain followers on his account was wrong.
The First Amendment, which says that “Congress shall make no law . . . abridging the freedom of speech,” prevents censorship of Americans by the government. But Twitter isn’t the government; it’s a private social media company, so First Amendment protections don’t apply in the same way.
Some people have argued that Twitter is, in effect, a “public forum” since it’s a medium by which so many people disseminate and receive news and information. That reasoning doesn’t hold water: To be considered “public,” the forum has to be owned or controlled by the government, like a public park or a street corner.
As a private company, Twitter, not the government, controls the accounts of its 300 million users, including Donald Trump. As its terms of service outline, Twitter “may suspend or terminate your account . . . at any time for any or no reason.” So even though the president can block individuals from his own account, Twitter has the ultimate control of @realDonaldTrump.