I wonder if she would still become COO of Facebook without Harvard MBA and all the oportunities resulted from it.<p>MBA is probably really not necessary, but if you have the oportunity to do one on a top school, it may open some doors and expand your network. At least it has no negative effects (if you can efford it).<p>Especially if you have technical background and want to move to management position. It simply diversifies your  background and strengthens signaling.