In my opinion, I think there is ever time when it is necessary to limit freedom of expression, and we can use two examples to explain that. First, the people need to control themselves, if they go to some unhealthy things from the internet like the porn or so on are all bad. At time, peoples' freedom should be limited and stop them to do that. Secondly, if the people do something bad for the government or country, they should be limited the freedom like go into the cell. So that is all my opinion, maybe is right, maybe is wrong, just decide by peoples' mind.