Mark Zuckerberg, founder and CEO of Facebook. - Photo courtesy Facebook image:35629:0::0

Zuckerberg started Facebook in 2004 from his Harvard dorm room. He left the school to concentrate on building the site.

Zuckerberg got initial investment of $500,000 from PayPal co-founder Peter Thiel. And since then, the site has become a hot product.

Microsoft purchased a minority stake of 1.6 per cent from Facebook for $240 million last year and the deal made Facebook valued at more than $15 billion.

Then, Zuckerberg owned 27 per cent of the company according to reports, and with the company being valued so high, it means Zuckerberg owns about $5 billion in shares. Forbes and other investors however think the company’s value is lower. Forbes thinks the best estimate for Zuckerberg now is $1.5 billion.

Facebook currently has 66 million active users, and 55,000 networks and with estimated annual sales of $150 million.

In the Forbes list of billionaires Zuckerberg is ranked 785, Warren Buffett ranks number 1 and Bill Gates ranks number 3.

He is the youngest billionaire in this and the previous lists and “possibly the youngest self-made billionaire ever” according to Forbes.

Here is the full list of billionaires.