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The operation led to the arrest of 46 people in Australia, and other investigations are ongoing.
BBC News has obtained a transcript of Hansen's conversation with Sweetie, whom he took to be nine-years-old.
The goal, they say, was to shed light on a growing form of webcam-based child exploitation, which has snared thousands of victims in the Philippines alone.
Scott Robert Hansen, 37, pleaded guilty to three counts in a Brisbane court this week, admitting to possessing images of child sexual abuse and sending lewd pictures of himself to Sweetie.
Workers from the charity Terre des Hommes went undercover in chatrooms for ten weeks last year, posing as Philippine girls and using Sweetie to lure potential predators via webcam.
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A global sting operation involving a virtual ten-year-old girl named Sweetie has led to the conviction of a registered sex offender in Australia, marking what is believed to be the first conviction since the avatar was created last year by a Dutch rights group.