One in four children receives or sends explicit material over the Internet, says a survey.
The research by broadband provider TalkTalk found that out of 500 kids quizzed, one in 20, aged between six and 15, had contacted a stranger via webcam and one in 50 had met a stranger they first contacted online.
More than six out of 10 said they misled their parents into believing they were doing something else online and over half said they deleted the history of their visited websites to keep their family in the dark, reports the Telegraph.
Prof Tanya Byron, child psychologist and broadcaster, oversaw the TalkTalk research which also discovered that one in nine children had either bullied someone online or been bullied themselves.
Prof Byron said: "It's crucial that parents educate themselves about what's going on online and what their kids are doing there."