Facebook's infamous 2012 IPO offers a preview of what could go wrong for SpaceX

EMMANUEL DUNAND/AFP/GettyImagesHype is building ahead of SpaceX's IPO pricing on Thursday.Facebook's turbulent debut back in 2012 is an example of what can go wrong with a major tech IPO.Here's what happened then, and what has some market pros worried ahead of SpaceX's debut.The excitement ahead of SpaceX's colossal IPO this week is palpable, with investors gearing up for a historic debut.But with hype reaching a fever pitch, some may be wondering: "What if the IPO goes badly?"For anyone looking