Sign up for The Brief, The Texas Tribune’s daily newsletter that keeps readers up to speed on the most essential Texas news. For nearly four hours on Monday, the U.S. Supreme Court heard arguments in a pair of cases that challenge how far states can go to limit the content social media companies allow on their platforms. The lawsuits, which were brought by two tech trade groups, challenge whether Texas and Florida can legally prohibit large social media companies from banning certain political posts or users.