Using the computer, good points and bad points

Computer is a necessary tool for modern society, but it has both good points and bad points.
For example, it has 2 good points. One is we can get easily various information which we need at any time. The other is it makes business more efficiency. We can make document or postcards and we can contact with trading partner soon. However, sometimes it's dangerous tool for us especially children. It has various bad information for them. Also, some people use it for a long time, so they have less time to talk to their family.
We must remember it has not only good points but also bad points. We must careful of bad information.