BRUSSELS, Dec 5 (Reuters) - Elon Musk's social media company X was fined 120 million euros ($140 million) by EU tech regulators on Friday for breaching EU online content rules, the first sanction under landmark legislation which will likely draw the U.S. government's ire.

Rival TikTok staved off a penalty with concessions.

Europe's crackdown on Big Tech to ensure smaller rivals can compete and consumers have more choice has been criticised by the administration of U.S. President Donald Trump, which says it singles out American companies and censors Americans.