Do you know what your child is doing online right now? If you answered yes, you're lying to yourself.
Unless you've installed spyware and can see exactly what your child is doing, odds are your little dear is doing something he or she would not want you to know, like the following:
Here are some steps you should take:
That should give you enough to start with. Feel free to reach out for platform-specific tips! And let us know how it goes!