'X' logo is seen on the top of the headquarters of the messaging platform X, formerly known as Twitter, in downtown San Francisco, California, U.S., July 30, 2023. REUTERS/Carlos Barria/File Photo Acquire Licensing Rights Sept 7 (Reuters) - X's new content moderation policy made it challenging to convince brands that the Elon Musk-owned social media platform was safe for ads, according to the company's former head of brand safety and ad quality. The company announced in April its "Freedom of Speech, Not Reach," policy, under which it began to limit the visibility of some tweets that violated its policies rather...