Haven't we been 'expecting' this since 2012, yet the biggest, most successful unicorns keep going up in value.

For all the hype and doom about Square stock, the price is back to where it was when it began trading a month ago, although it has fallen 20% in recent weeks.

But this is a good opportunity for employees to understand the risks of stock options, but it's not like the world is coming to an end. Such risks have always existed.