Addthis Socialbookmarking Wordpress Widget
Another way to build up backlinks for your blog is to have links from social bookmarking site. Addthis.com is one of the socialbookmarking facilities that allows people to bookmark to several bookmarking site by pressing a SINGLE Button.
There is a Social Bookmarking Wordpress Widget make available to make your task easier. You can add this widget on your blog site bar, your visitor can choose to bookmark it and they can bookmark to several social bookmarking authority sites at one go, you can enjoy the immediate increase of backlink from this site… 
http://wordpress.org/extend/plugins/addthis-sidebar-widget/
Hope it is useful for you… Enjoy
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