Nottingham Crown Court heard how Costi had had sex with a 14-year-old girl in a Swindon hotel in August 2004 after meeting her through an internet chat room.
The court also heard that he had sex with another girl, aged 13, in an alleyway near London's Waterloo Station in January 2005, following a conversation on the internet.
The scheme, a multi-national organisation set up to tackle internet child abuse, invites youngsters to go online to report suspicious grooming activity.
Costi, a media student, was arrested after arranging to meet the 14-year-old at Nottingham railway station for sex.
'Serious abuse' During his trial he admitted meeting three girls, aged 13 and 14, following sexual grooming.
He also admitted three counts of sexual activity with a child, two counts of making indecent images and the possession of more than 40 indecent images of children.
A sex offender who was caught through an anti-paedophile website has been given a nine-year jail term for sexual grooming and pornography offences.
Lee Costi, 21, was sentenced at Nottingham Crown Court where he admitted grooming schoolgirls for sex.
Earlier that month, Yahoo removed or barred the posting of 70,000 rooms whose names suggested illegal conduct, including the promotion of sex between adults and children.
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