Hi Ben,
I was very glad to get your letter. I fully agree with you that computer playes a great role in daily life. It's not a secret that the net has changed the reality. People around the world meet and connect on-line and the world around us seems smaller. Can you see how many opportunities the Internet opens before us? I can't imagine my life without the Internet as it helps me to study. For example, it helps me prepare reports and make beautiful presentations. Thanks to it I have an opportunity to access news, documents, images, sounds, video games, sport reports, to make friends. Last time i try to spend less time working with my computer and spend it on my hobbies such as ... (your hobbies). All in all computer is not so dangerous if it's used wisely and moderately, it can help you to save a plenty of time.
I hope you spend your time wisely
Best regards
(your name).