tweet was immediate, overwhelming and provides a good lesson on why 140 characters should not be used to comment on controversial or sensitive issues, especially those dealing with the Middle East."

While her tweet attracted controversy, a tribute to Fadlallah came from another seemingly unlikely source: the UK ambassador to Beriut.

Frances Guy, who has headed the mission since 2006, wrote on her official Foreign Office blog: "Lebanon is a lesser place … the world needs more men like him, willing to reach out across faiths, acknowledging the reality of the modern world and daring to confront old constraints. May he rest in peace."

Comments beneath the post were mainly positive, although one read: "Her esteemed predecessors, such as Sir John Gray, lived in mortal fear of being blown up byFadlallah's Hezbollah hoods. So much for the 'admired Shia leader' she refers to above."

Nasr is one of the more high-profile victims of a phenomenon known as "twittercide". A notable UK casualty was Stuart MacLennan, a Scottish Labour candidate deselected a month before the election for using Twitter to call old people "coffin dodgers" and David Cameron "a twat".

Last month an Irish exam supervisor was dismissed after using his phone to tweet: "I do pity the girls that have me supervising, im young, handsome & probably very distracting ha ha". Meanwhile a columnist for Australia's Age newspaper lost her job after tweeting her wish that an 11-year-old child TV star "gets laid".