A proposed class action lawsuit accusing Facebook of violating a federal anti-robocall law may not go forward because the social media company’s unwanted text messages are not covered under federal law, the Supreme Court ruled this morning. Justice Sonia Sotomayor wrote the unanimous decision for the high court in Facebook Inc. v. Duguid, court file 19-511, which was decided April 1. Justice Samuel Alito filed a separate opinion concurring in the judgment. The case concerns a federal law that imposes penalties of up to $1,500 for each unwanted call or text. The prohibition on such calls applies to dialing systems that can “store or produce telephone numbers to be called, using a random or sequential number generator.” To deal with a growing volume of telephone marketing calls, in 1991, Congress enacted the Telephone Consumer Protection Act (TCPA), which “restricts the making of telemarketing calls and the use of automatic telephone dialing systems …