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A comment on Twitter says an attacker used its API to match usernames to phone numbers. Parent comment

Re:Twitter says an attacker used its API to match usernames ... by nacs on Wednesday February 05, 2020 @02:56PM (#22250430)
If you use the web client, they have a header that asks for your phone number repeatedly until you give it.
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Re:Twitter says an attacker used its API to match usernames ... by fireattack on Wednesday February 05, 2020 @03:09PM (#22250522)
OP was talking about "Twitter asks to scan your contacts", not to add a phone number.
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