Computer monitors and a laptop display the X, formerly known as Twitter, sign-in page, July 24, 2023, in Belgrade, Serbia.E uropean Union authorities are looking into whether Elon Musk’s online platform X breached tough new social media regulations, in the first such investigation since the rules designed to make online content less toxic took effect. European Commissioner Thierry Breton announced Monday, Dec. 18, 2023 the opening of "formal infringement proceedings against X” under the Digital Services Act. (AP Photo/Darko Vojinovic, File)