A jealous hairdresser stabbed her boyfriend to death after losing her temper with him for spending too much time on Facebook. <br><br> Terri-Marie Palmer, 23, used the social network to post a message saying how much Damon Searson 'pissed me off sitting on Facebook, completely blanking me when I'm talking to him'. <br><br> Moments later, she snapped and plunged a bread knife deep into his heart while he checked his messages online. <br><br> She then rang 999 and claimed the unemployed 24-year-old had accidentally stabbed himself while they were 'messing around' in the caravan they shared in Heysham, Lancashire. <br><br> Police said Mr Searson was found on the floor inside the caravan with a duvet over him, while Palmer sat in the floor. <br><br> A blood-stained knife was found on the sofa behind Mr Searson. <br><br> Paramedics attempted to transport him to Royal Lancaster Infirmary but he was pronounced dead on arrival.