A lot can happen in few years. You can go from the vice president of engineering for Yahoo, to a guy looking for a job at Facebook, to a startup founder, to a guy that just sold that startup to Facebook for a jaw-dropping $19 billion.
And that's exactly what happened to WhatsApp co-founder Brian Acton. In 2009 he applied for a job at Facebook and was rejected. Here's his sad-but-hopeful tweet.
