Children will be warned about the dangers of using chatrooms in radio, cinema and online advertisements.
It follows several cases where adults took on false identities in order to meet up with kids and abuse them.
"We want to make sure that children are aware that people are not always who they say they are," said a minister.
A leaflet warning parents about the dangers of the internet has also been updated for the campaign.
Website
A website called "thinkuknow" has also been set up and you can link to it from this page.
The campaign is the third part of a £3 million Government project to protect young internet-users, which started in December 2001.
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Do you surf the net alone?
Have you ever felt unsafe in a chatroom?
Chatrooms can be safe if we're sensible
