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UPDATE 1-Twitter says user data meant for security purposes may have been used for advertising [Yahoo! Finance News]

Twitter, Inc.  (TWTR) 
Last twitter, inc. earnings: 4/30 07:00 am Check Earnings Report
US:NASDAQ Investor Relations: investor.twitterinc.com
PDF Twitter Inc said on Tuesday email addresses and phone numbers uploaded by users to meet its security requirements may have been 'inadvertently' used for advertising purp [Read more]