I hadn't noticed those until seeing your comment. It turns out they're generated by the same technique which Justin Tadlock posted about recently.

You create a menu with the links, then add that menu as the Social Links menu. Then the theme automatically detects which domain it is and serves the corresponding icon for each social network.

I have it working on my site now :) http://random.ryanhellyer.net/

Thanks for pointing out this feature. It's a really nice touch for them to have added to the theme.

Thanks to the Automatticians who made the theme!