The 24-year-old Dublin man, who cannot be named for legal reasons, used a false name and claimed to be 19 when he requested a friendship with the teenager on Bebo.
He later admitted to her he had used a false name and photograph but then became friends with the victim on another site and swapped phone numbers.
A number of text messages, some of a “sexual nature”, were exchanged before he arranged to meet the girl outside his local supermarket.
He then brought her back to the home he shared with his parents. They went upstairs to his bedroom and kissed before he asked for oral sex. He promised that he would not have intercourse with her.
The man later had sex and anal sex with the teenager. They then had sex a second time before going into the sitting room.
The man’s father, who had been in the back garden during the incident, came into the room and his son claimed he had been giving the teenager guitar lessons.
The man brought the teenager back to the supermarket where he had initially met her and bought her a number of bottles of vodka.
Her mother, who had thought her daughter had been meeting a friend, later collected her from outside the same supermarket.
Garda Lorraine Killilea told Róisín Lacey, prosecuting, the victim’s mother went to gardaí in May 2011 to report the incident — having overheard her daughter telling her friends what had happened.
Gda Killilea said the girl was “in a distressed state” and was later interviewed by specially trained gardaí.
She told gardaí the man told her he was 19 years old when they first became friends on Bebo in 2010.
They continued the friendship for over a year before they arranged to meet up in Apr 2011.
The man pleaded guilty at Dublin Circuit Criminal Court to two charges of defilement of a child at his home on Apr 29, 2011.
Garda Killilea said the man was arrested in May 2011 after the girl identified the house to which she had been brought.
He made full admissions and said he had known the girl was 13 years old but claimed she had consented to all sexual activity.
A victim impact report was prepared for the case but not read out in court.
Judge Mary Ellen Ring said she had concerns that the man had both “groomed and targeted” his victim.
“He falsely represented himself both in name and age and built up a trust,” the judge said, before she adjourned the case to later this month pending an updated psychological report.
She noted that a report indicated that the man was at “a moderate to low risk” of re-offending but said she wanted the report updated to specifically address “the targeting element” of the case.
Paul Greene, defending, said his client was genuinely remorseful for what had happened and has attended counselling.