Teenagers and young adults spend way more time on a computer now compared to when you were 17-22. Telling a teen not to waste time using a computer in the year 2010 is ridiculous, it's like telling them to stop using their cell phone. If you haven't noticed people today get on just fine spending time on a computer and doing other things. Using a computer won't waste away your teenage years if you also have other interests.
I think we are saying don't make your focus on getting all the latest gear, try to get out there and learn to talk to women and enjoy high school so you don't have regrets when your a old fart.