This is really great, I hope more startups follow. In today's funding environment startups that are angling for an IPO can stay private for a very long time. Many companies are raising billions of dollars over 5-10 rounds before looking to the public markets. That can mean a long time before employees may choose to exercise their options.

Pinterest seems to recognize that if you put in two years at an early stage of the company you deserve to share in future financial success.

I wonder why they made this move now? Specifically, I wonder if it came from the executives, investors, or both?