It's a part of Silicon Valley you don't hear too much about - from firings, to sexism, to age-ism...
Author Dan Lyons wrote about the darker side of tech start-ups in his book "Disrupted: My Misadventure in the Start-Up Bubble."
Lyons even compared working in Silicon Valley to joining a cult.
CNN's Laurie Segall spoke to him about his experience.
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