U.S. Supreme Court justices on Monday heard arguments about the constitutionality of a 2021 Florida law aimed at placing restrictions on social-media platforms, with attorneys for tech companies and the Biden administration arguing the law violates the First Amendment. Gov. Ron DeSantis and the Republican-controlled Legislature passed the content-moderation law after Facebook and Twitter, now known as X, blocked former President Donald Trump from their platforms after Trump supporters stormed the U.S. Capitol on Jan. 6, 2021. The state’s attorneys want justices to overturn a ruling by the Atla…