Social bookmarkings is a big deal, there are literally thousands of services that you can use in order to let the users of your site share the url's between them.
However it is too time consuming for you as an individual to sign up for literally all these services. Here Addthis enters.
Addthis is an incredible site that allows you to create buttons that allow your visitors to add your site to thousands of social bookmarking sites, in 10 seconds flat, no log in required.
They do have additional services for you if you register, but it is not a requirement.
I suggest anyone who has considered dabbling with social bookmarking to try the service.
The implementation is really easy - Here is a code snippet to illustrate (it was created without log in to the site, but works perfectly).
You will notice the code begins with an HTML tag and ends with an /HTML tag.
This is because I cut the above piece from the wiki that I am using, docuwiki by the way which I warmly recommend for it's easy set up and user friendliness. The code simply needs to be inside the body tags of your page.
The bookmark button looks like this:
Try it and share this knowledge with your friends!