A 39-year-old former nurse who posed as a gay teenage girl on social networking sites has admitted 49 sex charges - some against girls he met online.
The High Court in Glasgow heard how Barry McCluskey targeted 49 girls - aged 10 to 15 - between 2007 and 2010.
He also blackmailed some victims, who were contacted via Bebo and an instant messaging service.
Judge Rita Rae QC deferred sentence and remanded him in custody. He was also placed on the sex offenders register.
The court heard how McCluskey preyed on young girls from his family home in Glasgow's King's Park, which he shared with his wife and two children.
No physical contact
McCluskey, who worked as a staff nurse at an un-named Glasgow hospital, prowled the Bebo social network site before contacting them via the MSN instant messaging service.
The court was told he posed as a girl called Clare or Missy and used a profile picture of a young female. He also claimed to be gay or bisexual.
Alison Di Rollo, prosecuting, said he never made face-to-face or physical contact with any of the girls.
She said he initially complimented the girls, but soon got some youngsters to strip and perform sex acts for him as he recorded the footage.
Miss Di Rollo said: "Those who were, or became reluctant, he would ask to do more - telling them if they did not, he may have to forward the video they had already done to friends."
The court heard how one of his victims begged McCluskey to stop, claiming she hated what was being asked.
Another youngster was sick with fear, felt suicidal and her hair began to fall out.
One schoolgirl pleaded with McCluskey that her mother was seriously ill and he did not understand her pain.
But McCluskey told her: "Three more videos then I am out of your life forever."
Police began to look into McCluskey's behaviour in February last year after a complaint from the mother of a 13-year-old girl.
It was found she had been forced to carry out sex acts via a web cam.
Officers discovered that he had used 26 e-mail addresses.
McCluskey was not at home when officers went to search his house last July. He was instead found at the Erskine Bridge apparently contemplating suicide, claiming he had "done something bad".
An investigation, named Operation Trinity, later uncovered the full scale of McCluskey's behaviour.
McCluskey, who is now separated from his wife, also recorded schoolgirls as they shopped at an Asda store in the city's Toryglen and women getting changed at a leisure centre in the Gorbals.
The court was told almost 10,000 indecent images of children were found on his computers.
McCluskey faces a jail term when he is sentenced later this year.
Sineidin Corrins, deputy divisional procurator fiscal and head of Glasgow area sexual offences unit, said McCluskey "conducted a protracted online campaign of manipulation" and impacted "dozens of innocent lives" for sexual gratification.
She said: "The Crown Office and Procurator Fiscal Service worked very closely with Strathclyde Police to gather the computer evidence that allowed us to secure today's plea of guilty to 49 separate charges.
"This also allowed us to spare his victims from having to give evidence in court."