Sentencing Twitter abuse pair Isabella Sorley and John Nimmo, Judge Howard Riddle said it was "hard to imagine more extreme threats."
The pair admitted sending a series of abusive message to feminist campaigner Caroline Criado-Perez.
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An ejector seat manufacturer is to be prosecuted over the death of Red Arrows pilot Sean Cunningham at RAF Scampton in November 2011.
Police said the "active shooter", reportedly a lawyer, had since been shot by officers and they were not seeking any other suspects.