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- Mark Zuckerberg's net worth could shrink by $25 billion on Thursday.
- Meta's stock plunged 15% in premarket trading on Thursday as investors balked at its earnings.
- Amazon, Alphabet, and Microsoft shares also fell, raising the prospect of a Big Tech sell-off.
Mark Zuckerberg's fortune could shrink by $25 billion in a single day due to Meta's post-earnings slump.