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- Oprah Winfrey announced Wednesday that she's leaving WeightWatchers.
- The company's stock quickly plummeted, proving Winfrey still has massive cultural influence.
- The media mogul has long been heralded for her powerful "golden touch."
Oprah Winfrey's long-standing "golden touch" — and its reciprocal power — remain fully intact, evidenced by the Thursday morning plunge of WeightWatchers stock after the TV personality announced she was leaving the company on Wednesday night.