https://www.reuters.com/article/us-tiktok-ceo/walmart-joins-microsoft-bid-for-tiktok-as-ceo-of-social-media-app-quits-idUSKBN25N0DV >Walmart Inc said it was joining Microsoft in a bid for social media company TikTok's U.S. assets, revealing its plans hours after the social media company's chief executive, Kevin Mayer, said he would step down.