I really think Cramer's problem is with Sandberg. She is spending too much time promoting her book and not enough time promoting FB. I read or saw at least four with interviews with her and she mentioned very little about FB or Instagram. The only thing she is promoting is her book right. Mark just does not want to tell her that she really needs to start refocusing her attention on developing contents to promote FB. Face the fact: Most people, women or men, would have got canned by now if they were spending all of their time on unrelated job projects while their job performance was lacking. They surely would have got the ticket if they promoted competitor's products during interviews.
Mark and investors are caught between a rock and a hard place with her. If they try to get rid of her, she will likely retaliate against them. If they don't say anything about her not directing investors and users attention to the positives about FB, she will likely continue to push up cost until she causes major problems for the company. Mark really needs to sit down and have a serious discussion with her about job. Hopefully, she will listen and start power tripping on him or treating him like she is his mother instead of the boss.