How to sovle the internet addiction?

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Today's students spend too much time on the internet and they to tend rely too much on it.Actually,Internet is the better way for students to know this world.But Internet addiction is another serious society problem.There is always something not so healthy on the Internet.I think parents and schools should take measures to have control over student's contact with the net.Maybe the access to some web sites should be controlled or totally forbidden;and then,time they are on the net should be limited.