 Facebook co-founder Dustin Moskovitz was the youngest person on the list.Aged 26, eight days younger than Zuckerberg, he debuted at number 420 with an estimated fortune of $2.7 billion.IKEA founder Ingvar Kamprad was the largest loser as he saw his fortune plummet from $23 billion to $6 billion, dropping him from 11th to 162nd overall.