NEW YORK (TheStreet) Facebook (FB - Get Report) shares are soaring in after-hours trading, gaining 4.4% to $51.56 on news it's being added to the S&P 500. Facebook will join the index on Dec. 20.
In addition to the prestigious index, Facebook is also being added to the S&P 100 index.
--Written by Chris Ciaccia in New York
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