Looking back on 33 years of awesomeness and intensity. Steve Ballmer, who announced he is stepping down this year as 's CEO, ranks as the 21st richest person on the 2013 Forbes 400 List. The Richest People In America Buoyed by public markets, the average net worth of 400 U.S. richest rose $800 million to a record $5 billion. Billionaires: Surprising First Jobs [VIDEO] Looking at the people on FORBES 400 now, you couldn’t imagine them working at the burger counter, but hey, you gotta start somewhere. How Many Likes Can Mark Zuckerberg Buy? [VIDEO] Billions of dollars and billions of pieces of content -- how much does Facebook make from your content?
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