Media lawyer Paul Gilbert has told Daybreak that judges will have to decide on "whether or not a tweet itself is more than shocking or offensive."
He added: "It's finding a balance between what the law says about this and the freedom of speech."
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Acclaimed author Michael Morpurgo has written this piece of prose exclusively for ITV News to mark 100 years since the Battle of the Somme.
The War Horse and Private Peaceful author joined ITV News in Northern France to reflect on the sacrifices made at the Battle of the Somme.
Detectives investigating an arson attack have released CCTV of a man igniting two petrol bombs moments before hurling them at the shop.