A man was jailed for four weeks on Thursday for threatening to post semi-nude photographs of a teen on Internet if she did not strip down to her panties and pose semi-nude.

Johnson Song Jian Sheng, 24, had pleaded guilty to criminal intimidation on Nov 6, 2011. Then in national service, he threatened to cause injury to the 16-year-old girl's reputation on Facebook, with intent to cause her to comply to his demands.

A district court heard that posing as a female, Song had befriended the girl in June that year. On July 2, he chatted with the victim via webcam. He claimed that his webcam was not working, and hence, he could see her but she could not see him.

He suggested playing a game of "Hangman'', and told her whoever lost would have to remove a piece of clothing. She agreed. After losing a few games, she had stripped down to her panties. He then made her pose semi-nude infront of the webcam and took several screenshots of her.

Four months later - on Nov 6 - he was at his Jurong West flat when he messaged her to chat over webcam, but she refused. He then threatened to post her semi-nude photos he had taken earlier unless she came online to chat with him. That evening, he sent her two photos of herself, posing semi-nude, and another of her aunt's company website.

He then threatened to post the photos online. Fearing for her reputation, she did as she was told and stripped down to her panties. When he asked her to show her private parts, she exposed her breast and pushed down her panties.

Song could have been jailed for up to two years and/or fined.