Firstly there is the irony of a "blue collar hedge fund manager"
There's the fact the lack of an IPO bump means Facebook equity holders are the people who made money out of it, instead of the investment banks buying at the opening and hoping to sell at the bump price.
Then there's the whole "HN thinks Facebook is worthless and has the satisfaction of seeing the stock drop on the opening day." thing. Now it turns out all the self-congratulation over people's "insightful analysis" was probably misplaced - Facebook may or may not be overvalued, but the stock price probably doesn't reflect the market consensus yet.
Finally, in an ironic twist Shakespeare would have been proud of it turns out that it was probably the NASDAQ's computer system that meant Facebook missed an IPO bump. Silicon Valley loves talking about how Wall St over-hyped IPOs during the dot-com bubble and blaming it for the lack of a significant IPO exit strategy since. Now it was a computer system that failed Silicon Valley's great hope of reigniting the IPO market.