If you're looking for a scandal, how about the apparent gross underpricing of the stock by linkedin's investment bank? Isn't the reason companies hire these "experts" is that they have a good idea what price people will pay for your stock? Missing by over 50% is pretty bad.
EDIT: On the flip side, you can't blame the banks if the institutional investors are simply overpaying.
Every IPO underwriter has to make an educated guess as to the opening price of the stock. Again, the "apparent gross underpricing" won't really be apparent for months, and it certainly wasn't apparent at the time the IPO was priced, since we can assume that their underwriter does not possess True Financial Clairvoyance(tm).
EDIT: On the flip side, you can't blame the banks if the institutional investors are simply overpaying.