It should come as little surprise that Social Security numbers are posted on the Internet. But, says Betty Ostergren, a former insurance claims supervisor in suburban Richmond, Va., who has spent years trolling for them, “people are always astounded” to learn that theirs is one of them.

Mrs. Ostergren, 57, has made a name for herself as a gadfly as she took on a lonely and sometimes frustrating mission to draw attention to the situation. With addresses, dates of birth and maiden names often associated with Social Security numbers, she said, they are a gift to data thieves.

At the New York Times.

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