I came across this social bookmarking service from a webmaster forum and the social bookmarking service is called post toaster & is currently in beta stage.
Looks impressive and has been built with SEO in mind. Post Toaster is a time saving social bookmarking service which includes an option to select sites that do not support the nofollow attribute.
How to use:
Click on the lion logo above and drag and drop into your toolbar. This is your Post Toaster bookmarklet for easy posting. When entering titles and descriptions you can enter up to four of each. Post Toaster will randomly pair them for you within each submission. You must check the checkbox to the right of the title and description fields to activate your data.
For the full link please see www.posttoaster.com