Twitter says a certain someone tried to discover the phone numbers used by potentially millions of twits

Exploitable API blew away anonymity, abused by systems in Iran, Israel, Malaysia

Twitter has admitted a flaw in its backend systems was exploited to discover the cellphone numbers of potentially millions of twits en masse, which could lead to their de-anonymization.…

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Source: Theregister.co.uk/security / Article: "Twitter says a certain someone tried to discover the phone numbers used by potentially millions of twits"