The 28-year-old turned himself in to police Wednesday after a 15-year-old complained he tricked her into sex through the social-networking site, the Hong Kong Standard said.
The man allegedly met the teen on Facebook and promised her 6,000 US dollars to take part in rituals in October to rid him of bad luck, which involved having sex four times, the newspaper said.
When he failed to pay up, she reportedly tracked him down with a friend and seized his mobile phone, which contained photos and videos of around 70 other women and girls he allegedly tricked into sex.
Police issued an appeal to trace the man, identified only by his surname Tang and screen name Ah Dick, and were questioning him on suspicion of having sex with an underage girl.
Other women listed on his phone claimed they also fell for his scam, the Standard said.
Published 16 December 2010, 08:24 IST