By Danilo Masoni, Akash Sriram and Noel Randewich (Reuters) – Shares of Facebook owner Meta plummeted 26% on Thursday in what could be the worst single-day wipeout in market value for a U.S. company, after the social media giant issued a dismal forecast, blaming Apple Inc’s privacy changes and increased competition. The huge drop, erasing over $200 billion from Meta’s market capitalization and $29 billion from Chief Executive Officer Mark Zuckerberg’s net worth, spilled over to the broader technology sector and dragged the Nasdaq Composite Index lower. It marked the company’s worst one-day los…