I think most of the youth who use internet whould use this add-on for firefox. It notes all the sites that we have viewed, also notes the time we spent on each page. When we click the link given below after installing it specifies what percent of the time we have wasted on each and every particular page.
For sample,
| wordpress.com | 2 minutes | 0.2% | ||
| www.geocities.com | 95 seconds | 0.1% | ||
| www.google.co.in | 93 seconds | 0.1% | ||
| news.bbc.co.uk | 80 seconds | 0.1% | ||
| mail.google.com | 79 seconds | 0.1% | ||
| prashix.wordpress.com | 59 seconds | 0.1% | ||
| images.google.co.in | 40 seconds | 0.1% | ||
| pageaddict.com | 36 seconds | 0.1% | ||
| us.geocities.com | 24 seconds | 0% | ||
| www.bbc.co.uk | 24 seconds | 0% |
An awesome tool which also helps us to restrict and also tag about any page. Good to use.