The female of the species is more deadly than the male when it comes to online revenge on other women.

According to a report conducted by Mymemory.com a quarter of women  are deliberately posting unflattering pictures of their former friends after falling out with them. And a third admit that they were actually taking revenge on those who had done the same to them. The survey said that two fifths of the 1,500 women asked revealed that they had posted a picture of their friend without make-up and a fifth confessed to refusing to take down the offending picture when asked.

Two thirds of those polled said they would be furious if a friend uploaded a flattering picture of them, while three quarters said they regularly de-tagged unflattering pictures of themselves. The research shows that an increasing number of people are using Facebook to humiliate their friends.