Of those responding positively to the question, one in three claimed they were doing so out of retribution for a similar slight made against them. A majority of the rest said they had fallen out with the friend in the photo.
75% of participants said they were in the habit of detagging themselves from photos they felt were unflattering, but a fifth of women said they were not swayed by a friend's request to have the photos removed from Facebook.
A full two-thirds would get mad if a friend were to post an unkind photo of them to the site.
"To see that so many women deliberately commit ‘photo sabotage' and upload unflattering pictures of friends is somewhat surprising," said MyMemory co-founder Rebecca Huggler, "particularly when you consider how many said they'd be mad if the same was done to them."
An earlier survey conducted by the site found that Brits are drunk in the vast majority of the photos that appear on Facebook. Some 76% of nearly 1,800 Facebook users polled said they were at one stage or another of inebriation in most of the photos in which they were tagged.