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Linda Twombly, Nashua, NH

Linda Twombly in her Nashua, NH, home.

John Tully for The Wall Street Journal

In the weeks before the New Hampshire primary last month, Linda Twombly of Nashua says she was peppered with online ads for Republican Senate hopeful Jim Bender.

It was no accident. An online tracking company called RapLeaf Inc. had correctly identified her as a conservative who is interested in Republican politics, has an interest in the Bible and contributes to political and environmental causes. Mrs. Twombly's profile is part of RapLeaf's rich trove of data, garnered from a variety of sources and which both political parties have tapped.

RapLeaf knows even more about Mrs. Twombly and millions of other Americans: their real names and email addresses.

From The Wall Street Journal
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