Mark Zuckerberg Falls To No. 66 On ‘Forbes’ Billionaires List

Although Facebook Co-Founder and CEO Mark Zuckerberg is still the second-youngest billionaire in the world (to fellow Co-Founder Dustin Moskovitz), he plummeted on Forbes' list of the richest people in the world. Zuckerberg went from No. 35 in 2012 to No. 66 this year, according to figures released by Forbes Monday.