Sheryl Sandberg admits she was terrified to step onto the TED stage in 2010 -- because she was going to talk, for the first time, about the lonely experience...
Sheryl Sandberg: So we leaned in ... now what?
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Sheryl Sandberg: Take The Lead Challenge
Sheryl Sandberg Addresses the Class of 2012
Sheryl Sandberg, Barnard College Commencement 2011