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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Three drivers filmed racing at speeds of up to 134mph have been given suspended prison sentences and banned from the roads for 12 months.
Marvyn Iheanacho, 39, flew into a rage and subjected his girlfriend's son Alex Malcolm to a brutal attack in Mountsfield Park in Catford.