Why computers are useful for teenagers how often teenagers use computers and what for what gadget you would like to have,why ответить на вопросы

Приветствую Вас!
1)Why computers are useful for teenagers?
There's plenty of interesting sites.

2)

How often teenagers use computers and what for?
When they want to find the right thing there

3)
What gadget you would like to have,why?
Camera.Because I love taking pictures.