https://www.reuters.com/article/us-tiktok-ceo/tiktok-ceo-mayer-quits-after-three-months-amid-sale-talks-idUSKBN25N0DV >TikTok said on Thursday Chief Executive Kevin Mayer has stood down just three months after joining, in the middle of negotiations to sell the Chinese-owned video app's U.S. operations to Microsoft Corp and Oracle Corp.