> Tech Industry Elon Musk put so much of his fortune into X.com, he had a mere $4 million left in all the world. This wasn't the 21st century X.com. This was 1999, the height of the dotcom boom. Musk had just sold his first startup, a city guide website called Zip2 — PC maker Compaq wanted it for its search engine. Musk made $22 million on the deal. He did not play it safe with his winnings. The 28-year-old South African immigrant splurged $18 million on building a rather less modest idea. X.com was to be an online hub...