&quot;There&#x27;s a big difference between 50% and 99%. There&#x27;s a big difference between leaving your children a few hundred million and many billions.&quot;<p>There is a saying &quot;you can name the price if I can name the terms&quot;. Zuckerberg saying this and when he actually does this are two different things. (Per my other comment). I am not saying that he won&#x27;t (how would I know?) but this is a promise that is based on a future event that, given the age of both parents, could easily be 50 or 60 years in the future.  And of course exactly nothing will happen if he changes his mind (he isn&#x27;t going to issue a press release on that) and nobody has any access to his finances anyway. So he is free to say anything he wants for any reason and that of course could change. That said it&#x27;s his money and he can do what he wants with it. And there is no reason to even announce this if not playing some PR angle.<p>Edit: And to my point I just got a WSJ Technology Alert email with the headline &quot;FACEBOOK&#x27;S MARK ZUCKERBERG IS GIVING AWAY 99% OF HIS SHARES&quot; and then further down in a paragraph &quot;over the course of their lives&quot;.