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A comment on Twitter forces all new users to enter a valid phone number. Parent comment

Re:Twitter forces all new users to enter a valid phone number by cm2187 on Monday March 25, 2019 @07:58PM (#19487959)
The same is an efficient email anti-spam technique (greylisting). Except that you get all your emails delayed by 20min-5h, which will not make any user happy.
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