A federal district court judge has ruled the President cannot block users from his Twitter account based on their political views. The account is a public forum and as such the President's first amendment rights do not out weigh those of his Twitter followers. Read the full opinion and view the case filings at Justia.
MLB persuaded Twitter to suspend the account of Rob Friedman, which shows brief videos and GIFs of individual pitches from MLB games, but the fair use doctrine may protect Friedman's tweets.
In July of last year, the Knight First Amendment Institute of Columbia University filed a lawsuit against President Donald Trump, among others, claiming that the President's Twitter account constitutes a public forum subject to the First Amendment. The lawsuit alleges that by blocking certain users who are critical of him, President Trump is effectively denying those users access to a public forum in violation of the First Amendment.
In a somewhat surprising holding, a US district court judge in New York recently held that a news organization's embedding of someone else's tweet with copyrighted material violates the tweeter's right to exclusive display of the tweet.