I noticed there is a social bookmarking mod available, at a price of course, so I have uploaded my own instructions for this to the downloads (not approved as yet)
For anyone interested in making use of this, it basically adds the social bookmark icons to the footer of your shop, when someone who has (eg.) a facebook account, they click the facebook icon and it adds the site, with meta tag info into their facebook profile.
Id consider it a marketing method, its free and lets face it social sites are all the rage at the moment.
Anyway, you can see it working with facebook, yahoo, google, stumbledupon and del.icio.us here - www.breezy.biz
When its approved it will be in the other modules.
Need to modify the footer in your common files, and header in same location.