A paedophile downloaded hundreds of indecent images of children and gave online advice on how to abuse to other perverts.
Garry Mallabar claimed he was gathering evidence as a vigilante, but Teesside Crown Court heard he made no reports to police.
Prosecutor Harry Hadfield said Mallabar posed online as an adult who was offering a child for others to abuse.
“He claimed to be ‘Debbie’ who had a two-year-old daughter who was ready to be abused,” Mr Hadfield added.
“He also claimed to be David who had a nine-year-old daughter available for abuse.
“Several conversations took place on Facebook and Yahoo chat services.
“In these conversations, both parties went into sickening detail about their plans to abuse children.”
The court heard Mallabar advised other abusers how to medically prepare and encourage a child to be abused.
Cleveland Police raided Mallabar’s home after being tipped off by officers from another force.
“Police seized a computer and two storage devices,” said Mr Hadfield. “On these devices were more than 220 still and moving child pornographic images at the most serious category A.
“Some showed children in obvious distress who were gagged, and then beaten as they were being sexually abused.”
Mallabar, 42, of Elizabeth Way, Seaton Carew, Hartlepool, admitted two charges of making indecent images, one charge of possessing indecent images with intent to supply them, five charges of publishing an obscenity, and the relatively new charge of possessing a paedophile manual.
Dan Cordey, defending, said in mitigation: “There is no doubt the conversations were sick and disgusting, but they were just fantasy.
“They were in the context of two people of deviant sexual tastes, no real children were involved.
“Mr Mallabar is a sad, lonely, inadequate man who still lives with his parents,”
The Recorder, Mr Bryan Cox QC, jailed Mallabar forthree and a half years.
The recorder told him: “There is considerable evidence in this case that you are a committed and hardened paedophile.
“I have to bear in mind the public interest in protecting children.”
Mallabar was made the subject of an indefinite sexual harm prevention order which bans any unsupervised contact with children, and restricts his internet use.
Mallabar must register as a sex offender for the rest of his life.