With full credit to Paulus103 for the explanation;

Zen Social is a module that provides icons for your site that link to your social media account - facebook , twitter etc.

What's different (good) about it is that the icons are font-based instead of GIFs or bitmaps which means they are much more flexible; they can be resized, coloured - formatted, etc.

Should be a link here to the download page....?

As of 26-10-13 this is pointing to a members download

www.joomlabamboo.com/download-document/578-zen-social-joomla-25-/-3-module

This will change shortly