THE MAJORITY of women posting the photos said they did so after falling out with their friends, while nearly a third said they were taking revenge on people who had done the same to them.

多数上传朋友丑照的女性称她们是在和朋友闹翻后才这么做的，而有近三分之一的人说她们是以此报复那些上传自己丑照的人。

Two fifths of women also admitted deliberately¹ posting photographs of their friends without make-up. Even when asked to permanently² delete the unflattering（准确无误的） picture from Facebook, a fifth of women said they had refused to do so.

The survey of 1,500 women aged³ over 18 by Mymemory.com, a photo gift website, adds to growing evidence that people use Facebook to embarrass or humiliate⁴（羞辱） their friends.

While people can remove their names from pictures, they cannot delete the photograph.

Facebook has refused to get involved in the disputes, saying that unless photos have broken the site's terms and conditions, individual users must find the solution amongst themselves.

Three quarters of women said they routinely "de-tagged" photos of themselves if they did not like the pictures, while two thirds polled said they would be "angry" with a friend for uploading unflattering pictures of themselves.

Rebecca Huggler, co-founder of MyMemory.com, said: "The etiquette⁵（礼节，礼仪） of tagging friends in photographs on social networking sites is a tricky⁶ one to master, and with so many pitfalls⁷, we wanted to look into women's relationships with the photographs they upload to the sites in question.

"To see that so many women deliberately commit 'photo sabotage⁸' and upload unflattering pictures of friends is somewhat surprising, particularly when you consider how many said they'd be mad if the same was done to them.

"Photo sabotage is never kind, but I think we've all seen pictures on social networking sites that we know the 'victim' won't be happy with. It's always a good idea to check with your friends before uploading; they'll thank you, and it could prevent some serious fallout."

Last month, psychologists at the University of Bath found that women are more attracted to social networking websites than men, who prefer gaming and gambling⁹ sites.

The research, which looked at the differences between what the genders¹⁰ enjoyed doing online, discovered that men are more likely to visit entertainment, betting, games and music websites.

However, women are more attracted to social networking sites such as Facebook and Twitter.