> It's hard to imagine that Facebook, Twitter, Dropbox, Google, Amazon, Apple, and all the rest of the companies that hire software developers, who have more or less the same type of interview, have gotten things wrong, yet have been so successful in hiring good people and building good products.

It could be also cargo cult.

If you are a startup, how you will add a technical founder or a first technical hire? Just by his/her ability to write O(log n) searchs in a whiteboard or you will dig deeper and make sure is the perfect match?