Max Levchin — Ukrainian Businessman born on July 11, 1975,

Maksymilian Rafailovych "Max" Levchyn is a Ukrainian-born American computer scientist and internet entrepreneur. He is the former chief technology officer of PayPal, which he co-founded in 1998. As CTO he is primarily known for his contributions to PayPal's anti-fraud efforts and is also the co-creator of the Gausebeck-Levchin test, one of the first commercial implementations of a CAPTCHA... (wikipedia)

Facebook is so ubiquitous now that it's like another manifestation of the web itself.
One of the things we did at PayPal was collaborative filtering and machine learning: looking at patterns of human behavior. We used it there to predict when people would try to cheat the system to get money. But you can predict pretty much any behavior with a certain amount of accuracy.
Mobile is the perfect example of what is enabling economic growth in the technology sector.
I'm trying to build something where people will go every day.
We're becoming slaves to our social networks - and that's not a bad thing. You like your favorite networks, so do you friends, and pretty soon you have market winners.