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There is no evidence that Elon Musk fired 2,000 employees at X (formerly Twitter) over a joke about Charlie Kirk’s death. No credible news outlet has reported this, and neither Musk nor X has made any such announcement.
What actually happened is that Musk criticized alleged comments from some Microsoft employees who were accused of mocking Charlie Kirk’s death, and Microsoft said it was reviewing the matter. This has nothing to do with X or mass firings.