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The rocket company's president reportedly said the letter, which circulated internally, made other employees feel "uncomfortable" and "bullied."
The popular app continues to face scrutiny over privacy and security concerns.
Facebook is accused of tracking its social media users on other sites even after they logged off.
The social network says a bug resulted in content mistakenly being labeled as possibly containing graphic or violent content.
The board unanimously recommends that shareholders vote in favor of the deal.