I know of somebody whose child was in contact with somebody she met online. She was 12 and he got her sending him indecent photos and doing things on webcam. He was texting her all the time. He was 21. When her parents found out, they involved the police, removed her access to phone, computer, ipod etc and had to involve the school to limit her access there. The girl had counselling as she truly belived that the man loved her.
She even met up with him behind her parents backs. The police told the girl that the man was doing this with several young girls, to try and show her that he didnt love her, but she wouldnt believe anyone.
It went to court, and he got sentenced, but he pleaded guilty to a lesser sentence which meant that the girl didnt have to go to court.
The girl now 18, can now see what really happened, but for years, she blamed her parents for stopping her seeing her true love, as that was what she truly believed after the grooming.
Parents need to discuss these things with their DC, have full protection on computers and other devices to limit access and periodically check facebook friends etc.
Back when I was a teenager, the worst that could happen were people spreading rumours about a girl "doing it", nowadays, boys can take pictures of girls giving blowjobs, or in intimate poses and send them to all their friends. Teenagers dont realise the risk of this happening. or going online and using webcam, then being blackmailed by the threat of telling their parents if they dont continue.