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Kayleigh Haywood, lured to the home of Luke Harlow via Facebook, was held hostage by Harlow and his neighbour.

Claire Wood met George Appleton on a dating site. When she ended the relationship, he harassed her.

Stefano Brizzi met Gordon Semple online. After arranging to meet, Brizzi strangled him.

Sofyen Belamouadden was beaten and stabbed in a frantic attack by a gang at a train station.

When Brian Lewis' relationship with his girlfriend began to fall apart, he became jealous of her.

Tony Bushby used fake Facebook accounts to gain the trust of Katie Briscoe.

Stephen Port poisoned and murdered four men whom he'd met on gay dating sites.

After Joshua Davies splits with his girlfriend, he posts messages on social media saying that he wants to kill

Vicky and Michael's relationship ends due to his infidelity with women he met online.