Supreme Court weighs in on federal laws and social media

WASHINGTON — The Supreme Court opened the door Monday to broad new challenges to regulations long after they took effect, the third blow in a week for federal agencies. The justices ruled 6-3 in favor of a North Dakota gas station that wants to sue over a debit-card swipe fee regulation that a federal appeals court in Washington upheld 10 years ago. Federal law sets a six-year deadline for broad challenges to the regulations. In this case, a Federal Reserve regulation governing the fees retailers must charge must…