A teenager sent pictures of herself and her friend having a threesome with another man to her friend's boyfriend, a court has heard.
Abigail Stringfellow had used her mobile phone to take pictures of the encounter. She then sent them as so-called "revenge porn" to her friend's partner after a row about a coat.
The 19-year-old has now admitted disclosing private sexual photographs and films with intent to cause distress and faces a potential jail term.
The court heard Stringfellow, from Northern Moor, Manchester, sent two videos of her former friend having sex with the unknown man and another image of the woman in her underwear.
The victim, who cannot be named for legal reasons, later received an angry phone call from her boyfriend, who she claims assaulted her.
He is currently awaiting trial.
In a statement, the girl said: "Abigail's actions have destroyed my life. She has humiliated me embarrassed me and brought about the end of my relationship. I hate her for what she has done. I want her to know what her actions have led to.:\
Prosecutor Laura Taylor said: "The victim was 17 at the time of the incident and had engaged in a sexual encounter with the defendant and an unknown male.
"The engagement in sexual activity was consensual and the defendant filmed it on her iPhone. After this took place the complainant asked the defendant to delete the recording - but she refused.
"On April 20, the defendant and the victim had a disagreement and after this the victim received a number of phone calls to her place of work from her then partner."
The prosecutor added: 'He requested that she attended his home address after she finished work. She did and at that time she was subject to a violent attack by him.
"He said that the defendant had shown him three images of the victim engaging in sexual encounters at the time that he and the victim were still in a relationship."
Matthew Wallace, defending Stringfellow, said in mitigation: "The defendant and the victim were friends and this encounter with a male which they were both involved in was consensual and consensually filmed.
"Miss Stringfellow disputes that she was asked for it to be deleted. The two of them watched that film a number of times together before they fell out. It was consensual and the filming was taken with her knowledge.
"They started to fall out after they went to a hotel room with a young male. Following this the victim stole the male's jacket and did not return it, saying that Miss Stringfellow had taken it.
"Miss Stringfellow was accused of being a thief and became very angry, and contacted her boyfriend to explain where the jacket had come from and he said he didn't believe her so she said she could send proof that the victim had been unfaithful in the past.
"She was trying to clear her name relating to the theft and she was angry. They are graphic images. She didn't anticipate that the victim would come to physical harm."
Mr Wallace added: "Their relationship has broken down because of this allegation between them about this jacket. That was why she sent those images. She deeply regrets what she has done.
"This situation is a whole big mess. It was a rash act that she did. She knows the significant damage what she has done."
Stringfellow will be sentenced at a later date. The offence carries a maximum two year prison term.