Twitter explores 'undo send' feature for paying users

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Twitter, Inc. (NYSE: TWTR) Delayed: 51.73 +1.62 (3.23%)
Previous Close $50.11    52 Week High $26.70 
Open $50.61    52 Week Low $13.73 
Day High $51.92    P/E N/A 
Day Low $50.19    EPS $-0.18 
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