[barrkel]

Zuckerberg's stock a bit different: the stock represents future income flows - they have real value - whereas cryptocurrency value is a function of confidence.

Yes, the stock would go down on Zuckerberg selling, but that's because people would infer from it an estimate of a decline in future income flows. But the future income flows won't go away just because Zuckerberg sells; it's not just confidence putting a floor on the stock.

[candiodari]

Whereas Mark Zuckerberg could exchange his shares for dollars ... which supposedly represent future tax income of the united states government ... paid in dollars.

Fiat currencies, including somewhat non-intuitively shares, dollars and every currency (including most forms of gold I might add) ultimately depend on confidence.

[imustbeevil]

It's a lot easier to have confidence that the US Government will exist in 50 years than one of one thousand fake currencies on the internet.