Plugin failure - multiple problems

This plugin is not performing as expected for the following reasons:

Tabs are not aligned, cascading regardless whether all 4 or 3 are shown, despite selecting shrink/expand

Despite selecting 'Don't pre-select social comments sharing' it asks for login to facebook

The facebook login doesn't work - says: Given URL is not allowed by the Application configuration.: One or more of the given URLs is not allowed by the App's settings. It must match the Website URL or Canvas URL, or the domain must be a subdomain of one of the App's domains.

At Facebook, I get this error: You have specified an App Domain but have not specified a valid integration URL.
diginomica.com must be derived from one of: Site URL, Mobile Site URL, Canvas URL, Secure Canvas URL, Page Tab URL or Secure Page Tab URL.