Don't know about the Saudi princes however the Koch Brothers have given away millions of dollars (and I am sure there also give away money anonymously as well).

http://www.kochfamilyfoundations.org/foundationsdhk.asp

Also rest assured that Facebook also "evades taxes" in the same way that the Koch brothers do, that is by taking advantage of the US Tax Code in a legal way. And none of us have any idea what the Koch Brothers have in their wills and have not publicly announced.

While Facebook is not doing everything it can to evade taxation in many countries, right? And let them choose what to do with the money. Why isn't Zuckerberg pledging to drive his company as a good citizen?

> Most everyday Joes might not have the means to change the world but it is certain that when turn into billionaire, they rarely pledge the quasi-totality of their fortune to improve the well being of others.

> If this is narcissistic, just let it be and be appreciate that for once, a great deal of money will be put to good use. The world is full of Koch Brothers, Saudi princes and European heirs to prove that most billionaires are more concerned about evading taxes rather than giving back.

I'm not so sure that's true. The ultra-rich actually donate a huge amount of money. Just last July a Saudi Prince announced he was donating over $30 billion to "philanthropic causes". And back in 2012 a bunch of them pledged to give away "half their wealth."

And those are just a couple of the bigger examples I found in 2 minutes of web search.

Also, I've never heard of anybody volunteering to pay more taxes. Everybody tries to pay less, so it's silly to fault the rich for doing it just because they're saving more in absolute terms.

Link 1: http://fortune.com/2015/07/01/saudi-prince-alwaleed-donation...

Link 2: http://www.christianpost.com/news/over-125-philanthropist-bi...

The more I think about the letter, the more I'm reminded of the poem Ozymandius. Are you familiar with it? The crux of the poem, up for interpretation, is that all empires are led by men of great confidence and eventually they return to dust over time. You know, like MySpace did before Facebook.

As my mum used to say "It's easy to shit when your butt is full".

How hard is it, really, to give away 99% when you're still left with enough to comfortably sustain 5+ lifetimes? Bill Gates said it well here: http://imgur.com/gallery/YDuoHdr

That said, I hope that if I ever get into a position like that, I too will be able to look beyond my personal greed and desire to increase the high score.