Microsoft and Yahoo are selling to political campaigns the ability to target online ads to users of their free email and other services, reports investigative journalism organization Pro Publica.
The two companies provide information on users' names, Zip codes and other registration information that users provide when they sign up for those Web services, according to Pro Publica, which notes that the companies don't notify users that their information is being used for political targeting.
Political campaigns can then match voter records to people's online identities and send them targeted ads.
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