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Tony Bushby used fake Facebook accounts to gain the trust of Katie Briscoe. After murdering her, he attempted to blame the murder on one of the fictitious profiles.

Stefano Brizzi met Gordon Semple online. After arranging to meet, Brizzi strangled him, and set about trying to dissolve Semple's body in a bathtub of acid.

When Brian Lewis' relationship with his girlfriend began to fall apart, he became jealous of her Facebook activity, resulting in her vicious murder.

After Joshua Davies splits with his girlfriend, he posts messages on social media saying that he wants to kill her. Egged on by others, he commits the murder.

Claire Wood met George Appleton on a dating site. When she ended the relationship, he harassed her, eventually strangling her and setting her body on fire.

Stephen Port poisoned and murdered four men whom he'd met on gay dating sites. He is suspected of six further counts of poisoning and seven of rape against another eight men.