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Re:Ask HN: How do you notify someone famous about a security... by muhpirat on Friday February 24, 2017 @05:03PM (#13728351)
If they have a bug bounty programm, look at it.

Also try to contact the $company's domain Admin (who.is e.x. give it to you) or, if availabel, the Network Abuse Team for further help to get in contact.

Re:Ask HN: How do you notify someone famous about a security... by miguelrochefort on Saturday February 25, 2017 @08:17PM (#13735046)
You don't.