Washington DC - A Texas law that targets Big Tech and authorizes the state to sue Facebook, Twitter, and other social media platform if they "censor" or "discriminate against" conservatives has been put on hold by the Supreme Court.

Acting on an emergency appeal from a coalition of tech trade groups, the justices issued an order on Tuesday to stop enforcement of the law.

In a 5-4 vote, conservative Justices Samuel Alito, Clarence Thomas, and Neil Gorsuch dissented. Liberal Justice Elena Kagan said she would have also denied the stay.

The case of NetChoice vs. Paxton was an early test for the Supreme Court test on whether conservative states can regulate what appears on social media platforms. The answer so far is no.

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Florida and Texas, the two largest red states, passed similar measures last year targeted at what Florida Governor Ron DeSantis called "the big tech oligarchs in Silicon Valley" and their "radical leftist" agenda.

Before he signed the Texas law, Texas Gov. Greg Abbott tweeted: "Too many social media sites silence conservative speech and ideas and trample free speech. It's un-American, Un-Texan, & soon to be illegal."

Florida's law was blocked by a federal judge and the 11th Circuit Court in Atlanta.

The Texas law had been blocked as well by a federal district judge, but on May 11, the 5th Circuit Court ruled with no explanation the law could take effect.

Lawyers for the social media platforms appealed directly to the Supreme Court. They wanted the law put on ice while the legal challenges proceeded in the lower courts.

The argument was that Texas law is unconstitutional because it gets the First Amendment backwards. As usually understood, the First Amendment's guarantee of "freedom of speech" prohibits the government from regulating speech or censoring the publishing of views and opinions.

However, the state of Texas claimed it has the authority to regulate privately run social media platforms to protect the speech of conservatives from being excluded or discriminated against.

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The Texas law says a social media platform, with more than 50 million users in the United States, "may not censor ... or otherwise discriminate against expression" of users based on their "viewpoint."

The targets of the law appear to include YouTube, Instagram, and TikTok, as well as Facebook and Twitter. Violators were threatened with daily penalties.

NetChoice and the Computer and Communications Industry Association urged the high court to intervene. They said the Texas law, if upheld, would deny social media platforms the right to remove offensive posts and instead make them "havens for the vilest expression imaginable."

They said platforms would be forced "to disseminate all sorts of objectionable viewpoints – such as Russia's propaganda claiming that its invasion of Ukraine is justified, ISIS propaganda claiming that extremism is warranted, neo-Nazi or KKK screeds denying or supporting the Holocaust, and encouraging children to engage in risky or unhealthy behavior like eating disorders."

In defense of the law, Texas attorneys said social media platforms that are open to the public are the 21st-century equivalent of the "traditional common carrier," like phone lines. As a result, they have to be truly open to all and may not "assert a First Amendment right to refuse service to their customers based on the viewpoints those customers profess."

While the Texas law remains on hold, the challenges to its constitutionality will continue before a federal judge in Austin.