Stock index futures edged up on Friday but major indexes were setting up to close their worst week of the year, while Facebook's debut could help lift battered investor sentiment. The S&P has fallen 6.7 ...

Shares of some top chemicals companies were down at the close of trading:Dow Chemical Co. fell $.76 or 2.5 percent, to $29.39.DuPont Co. fell $1.01 or 2.0 percent, to $48.84.

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