Facebook recommends patients with a psychiatrist's number on phone friend one another—outing them to each other. 

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Complex systems, wicked problems. Society, technology, science and more. @UNC professor. @NYTimes columnist. My newsletter is @insight: http://www.theinsight.org
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Facebook recommends patients with a psychiatrist's number on phone friend one another—outing them to each other. 

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zeynep tufekci Retweeted Kashmir Hill
Really important story from @kashhill, and exactly why I was concerned with WhatsApp sharing phone numbers with FB.https://twitter.com/kashhill/status/770357737632825344 …
zeynep tufekci added,
zeynep tufekci Retweeted
But that wouldn't stop FB from outing a shrink's patients to one another. You can't get one burner per patient. https://twitter.com/Trojan7Sec/status/770972016950276097 …
zeynep tufekci added,
Worst, Facebook's privacy insensitivity with phone metadata compromises WhatsApp & Two-Factor-Auth; but both are is essential for security.
If phone no is a source of privacy violations by Facebook you'll withhold it, but lose 2FA. You're now more hackable. Not a good trade-off.
you don't need phone no for app generated 2fa, and app generated passcodes are safer than sms 2fa https://www.wired.com/2016/06/hey-stop-using-texts-two-factor-authentication/ …
.@skinnyhandle Also, as far as I can tell, both Facebook and Google want your phone number *anyway* to allow app-based 2F-authorization.
yup they want the phone number as the backup for authenticator based 2FA. @skinnyhandle
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