There are only two parties hurt by this: 1. The premiere clients of Goldman Sachs and Morgan Stanley who bought into the lie that FB should trade at >100:1 P/E; and 2. Facebook. (1) I don't care about. (2) is the interesting one. You'll note that I don't include the employees in the list of injured parties. They're largely in a lockout anyway (I assume?). Whether it opens at $38 and drops to $30 or starts at $20 and…
This kind of statement first has to be qualified as "two parties immediately hurt by this. It is common for price moves in a well known stock to exert a strong psychological influence on similar stocks and on the broader market. All markets are subject to flux but where things have fluxed to currently, it seems quite possible that others could be "injured" here.
Sure Facebook's move could, might, be good for the tech industry if investor perception separated Facebook from the rest of tech industry. If not, it is easy for things to go from irrational optimism to irrational pessimism.