Baby Boom: Instagram, OMGPOP, and the new dotcom millionaires

Kevin Systrom (right), 28 Estimated net worth: $400 million With Facebook's $1 billion purchase of Instagram, the two-year-young photo sharing company, founder Kevin Systrom has become a very rich young man. (Instagram)

Mark Zuckerberg, 28 Estimated net worth: $17 billion With Facebook's IPO set to break records -- and leave the company with an estimated value of about $100 billion -- Zuckerberg is set to be a very wealthy guy. (AP Photo/Paul Sakuma)

Aaron Patzer, 30 Estimated net worth: unknown Patzer started the personal finance website Mint.com in 2006 and sold it to Intuit, the makers of Quicken and TurboTax, just two years later for $170 million. (Mint.com)

Andrew Mason, 32 Estimated net worth: $1.3 billion One of the poster boys for Tech Bubble 2.0, Mason, a dropout, became an overnight billionaire when online deal site Groupon went public last year. (Reuters)

Blake Ross, 26 Estimated net worth: $150 million Ross is a legend in the tech scene and is one of the original co-founders of the popular browser Firefox. In 2005, he was nominated for Wired magazine's top Rave Award, Renegade of the Year, opposite Larry Page, Sergey Brin and Jon Stewart. He was also a part of Rolling Stone magazine's 2005 hot list. (Blake Ross)

Charles Forman, 32 Estimated net worth: $22 million Forman's claim to fame was the overnight sensation of the mobile game "Draw Something," which was downloaded 20 million times just five weeks after launch. Last month, Zynga bought Forman's startup OMGPOP for $180 million. (Michael Galpert)

Kevin Rose, 35 Estimated net worth: $10 million The oldest of the crew, Rose has been an industry stalwart for some time, known best for starting the news aggregator site Digg, which was estimated to be worth over $200 million a few years ago. Google recently bought the site for $15 million as it looked to add Rose to the Google+ team. (Brian Solis)

Tim O’Shaughnessy (left), 28 Eddie Frederick (right), 29 Estimated net worth: $45 million each O'Shaughnessy and Frederick made it big with Living Social, an online competitor to Groupon.

Sam Altman, 26 Estimated net worth: unknown Altman founded Loopt, a social location-based mobile app while in his second year at Stanford. This year he sold the company to Green Dot Corporation for $43.4 million. (Loopt.com)

Mark Zuckerberg, 27 Estimated net worth: $17.5 billion Heard of Facebook? That guy Zuckerberg is really rich, huh? Facebook's IPO is expected next month. (AP)

Matthew Mullenweg, 27 Estimated net worth: $40 million Mullenweg is the brains behind WordPress, a free and open source web platform which powers 15% of the web. He has reportedly turned down offers of $200 million for his company, Automattic. (Matthew Mullenweg)

Pete Cashmore, 26 Estimated net worth: unknown Cashmore is the CEO and founder of Mashable, one of the most popular blogs on the net. In March, Reuters reported rumors of an acquisition by CNN valued at $200 million. (AP)

Naveen Selvadurai, 31 Estimated net worth: $80 million The Indian born Selvadurai is the co-founder of location-based social networking site Foursquare.com, a venture some value at $600 million or more. (Foursquare)