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Facebook changes privacy settings after outing members of a closed medical support group

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A closed group for women at genetic risk for breast cancer wasn’t as private as its members thought, according to a new report from CNBC.

The BRCA Sisterhood group was created as a support network for women with the BRCA gene, a mutation that greatly increases the risk of breast cancer, often resulting in preemptive mastectomy. The group was listed as “private” because of the sensitivity of the issue. But while the content of the group was closed to outsiders, the group’s membership was broadly visible, inadvertently revealing sensitive medical information.

Sisterhood members became aware of the loophole through a Chrome extension that allowed one of the members to download detailed information for thousands of members in a matter of…

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