If I compare that to a total market index (say, Vanguard's VTI) over a few years, it honestly doesn't look explosive or anything. Why not just invest in the total market (giving no preference for the valley), and be done with it?
Really, who the hell cares about volatility, when it's your retirement at stake /s
Really though, [anything that loses half it's market cap](http://www.reuters.com/article/linkedin-results-research-idU...) in a span of a day should not be in your retirement portfolio, and lets face it, most of these 'growth' oriented startups that go IPO, are susceptible to those losses.
EDIT: Just to clarify. When I say growth oriented, I mean the companies that burn through money to get as many users as possible, without a clear monetization strategy(other than, we'll sell ads).
