Machine learning, data mining and pattern recognition aren't brand new fields in any meaning of the word. I've had classes on them 20 years ago in college and I

Machine learning, data mining and pattern recognition aren't brand new fields in any meaning of the word. I've had classes on them 20 years ago in college and I know a lot of people with 8+ years of experience (including myself). Hell, my dad worked on them when he was in college 40+ years ago. Facebook pays more than enough to get world class experts so why would they not aim to hire them?