Director of Public Prosecutions (DPP) Keir Starmer has said that he will devise new guidelines on social media cases to aid prosecutors in future if charges should be brought.
Starmer's plans follow the news that a Welsh Premier League footballer who posted an abusive tweet about Olympic diver Tom Daley will not face charges.
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Damon Smith from Newton Abbot was found guilty of planting a home-made bomb on the London Underground in October.
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Megan Hurley had reportedly been at the concert with her brother Bradley, 21, who remains in hospital after the terror attack.