Below is the Nerd'ster. It's not the killer app but is only an example, a proof of concept, a reference implementation. 

The view below shows books recommended by my "nerd" network. Use the right arrow to see the network and click on other folks' names to recenter the network around them.

Use the Prefs menu to make it even more nerd with {trust statements JSON, equivalent keys}.

If you have a one-of-us.net identity, then click on the top left ("Viewing as.."), sign on in and submit, like, follow, or block.

A links to a view can be generated under the Etc menu (eg, my network's most recommended books).