By Mrinmay Dey (Reuters) – Elon Musk’s X on Thursday failed to block a California state law that requires social media companies to publicly disclose how they moderate certain content on their platforms. X, formerly known as Twitter, in September sued California to undo the content moderation law, saying the law violated its free speech rights under the U.S. Constitution’s First Amendment and California’s state constitution. The law requires social media companies with a sizable gross annual revenue to issue semiannual reports that describe their content moderation practices, and provide data …