Online Tracking Company RapLeaf Profiles Users By Name

12/25/2010 05:12 am ET | Updated May 25, 2011
  • EMILY STEEL wsj.com

RapLeaf says it never discloses people's names to clients for online advertising. But possessing real names means RapLeaf can build extraordinarily intimate databases on people by tapping voter-registration files, shopping histories, social-networking activities and real estate records, among other things.

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