Why do people need to communicate with computers?

Why do people need to communicate with computers? People want to communicate through computers because of following reason:

1.Communication is instant in nearly all aplication such email,chatting,conferences.

2.Cost effective even email and chatting are free.

3.No paper work needed.

4.Decision oriented as for decisions we need instant information.

5.You could communicate in multimedia form too through webcams and attaching files.