It may seem unrealistic to think about becoming a multi-millionaire before your 30th birthday, but think about all the people who did it. It's not some crazy story about a guy working hard for 10 years on one project before it finally took off. These are stories like David Karp, who started Tumbler and had close to 100,000 users within a couple weeks. He then sold it for a … [Read more...] about 8 CEOs Who Made Their Fortune Before They Were 30 [Infographic]