When they start chatting with the child, they usually ask general questions because everybody in the chat room can see the messages.
Sometimes adults who do not have friendly intentions may figure as children.
It is important to bear in mind that you know about your online friends as much as they have said about themselves.
Sometimes adults with a hidden agenda can only be in the chat room, without participating in the chat actively.
That way they collect information about the child and her/his interests.
What is especially attractive to the youth is that the Internet enables anonymity, which is impossible to achieve by any other means of communication.