While it may seem like you're only spending "a few minutes a day" on YouTube, Facebook, Twitter, and other websites, the truth might just surprise you. One way to find out where the time online is going is with the use of RescueTime, a website which offers a free way to evaluate your time online.
Lifehacker.com provides this excellent profile of RescueTime, including how to use the free 14-day trial account to get a quick picture of where you can optimize your time management.
Check out the article and give RescueTime a try. What you find out may surprise you (and make you more efficient).