Mark Zuckerberg is world’s youngest ever self-made billionaire according to Forbes Magazine. And just who is Mark Zuckerberg? Mark Zuckerberg is the now 23-year-old co-founder and CEO of the the currently biggest and most used social networking site with 350 million active users worlwide, Facebook. And yes, that’s right, he’s only “23 years old”.

The former Harvard student is approximately with $1.5 billion based on a supposedly conservative valuation of Facebook that is $5 billion with an approximated annual sales of $150 million. Zuckerberg owns roughly 30 percent of Facebook and the remaining shared by co-founders Dustin Moskovitz, Eduardo Saverin and Chris Hughes.

Mark Zuckerberg originally launched Facebook as a Harvard thing back in 2004 in his dorm room in the said university then decided to spread Facebook enlisting the help of his roommates and fellow Computer Science students Dustin Moskovitz, Eduardo Saverin, and Chris Hughes to Stanford, Darthmouth, Columbia, Cornell, Yale and other schools with social contacts with Harvard. It then later expanded to include any university student, then high school students, then anyone aged 13 and above.

Because of the addictiveness of Facebook, it has been blocked intermittently in Syria, China, Iran and some other countries. It has also been banned in many workplaces to discourage employees being distracted and wasting time on Facebook.

In 1008, Time magazine added Zuckerberg as one of The World's Most Influential People.

So where and what were you doing when you were 23 years old?