Totally agree on the "risk" assessment. However, when you are young you can take outsized risk for the first few years. A company like GOOG or FB isn't going to implode overnight. The upside scenario is much more likely than the downside. So, I agree with the risk reduction and diversification argument, but I would wait a few years. The benefits of having significant market outperformance in one stock while you're young will carry over into the life of your nest egg.