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.