Computer is almighty tool...?

Today, so many people have and use PC in developed countries. You know, computer is very useful. For instance, if you can use internet you can talk with other people who stay other countries at your house. And you can get many information easily. PC make our lives more convenient and now PC is not able to lack for our lives. But is PC almighty tool? Aren't there any problems? I think PC have also bad things and make new gap between some people who can use it and other people who cannot. On the internet, we cannot know these people's real name and their face and there are so many information that we cannot tell these information is truth or not and cannot use them perfectly. There are many denger at using PC but we cannnot stand not to use PC. So we have to be careful to use it, and don't forget these dengers absolutely.