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Sheryl, Sheryl, Sheryl. It's been quite a week, for us and for Facebook's COO. Sheryl Sandberg isn't the kind to yell, like the 10 tyrants we featured this week. She's much more subtle than that. Or at least we thought she was, until she botched product marketer Ben Ling's high-profile return from Facebook to Google. Sheryl, sounds like you need some advice on how to end a relationship. May we suggest talking to Pownce's Leah Culver? (Photo by tifotter)