These sites allow you to store, tag and share links across the internet with friends and people with similar interests. You can also access your links from any computer you happen to be using.

So, if you come across a page that you find interesting and want to save for future reference or share it with other people, simply click on one of the links at the bottom of the page to add it to your list.

All of these sites are free to use but do require you to register. Once you have registered you can begin bookmarking.

Each of the sites works slightly differently so use the links below to find out which service best suits your needs.

Del.icio.us
To register, go to: http://delicious.com
For more information: http://delicious.com/help

Digg
To register, go to: http://digg.com/register
For more information: http://digg.com/about

StumbleUpon
To register, go to: http://www.stumbleupon.com/signup
For more information: http://www.stumbleupon.com/aboutus/

reddit
To register, go to: http://reddit.com/login
For more information: http://reddit.com/help/faq

Facebook
To register, go to: https://register.facebook.com/r.php
For more information: http://www.facebook.com/facebook