Meta Platforms, the parent company of Facebook, has lost more than half a trillion dollars in market value since its August 2021 peak. Half of that vaporized in a single day, the biggest drop ever in the global stock exchange history. Once the sixth-largest company in the world by market capitalization, Meta has fallen out of the top ten, replaced by two computer-chip makers, Warren Buffett’s Berkshire Hathaway and the Chinese e-commerce company Tencent.