Nathan,
Glad you like what you see
We don't get the question often, but if you leave the API, App, and Secret keys blank, you should be able to use the social aspects of JFBConnect just fine. You won't be able to log in using Facebook, and you may get some red errors in the overview page in the admin area, but you can disregard those. If you run into any issues doing this, just let us know and we can help you get around them.
So then... If your mainly interested in the sharing, liking, and/or commenting aspects of Facebook integration, initially at least, we'd recommend you focus on the Open Graph tags first. The Open Graph tags, like normal HTML meta data, are how you describe your page to Facebook. To setup this integration, go into the Social configuration area and click into the Open Graph tab. Make sure OG integration is enabled, and we'd recommend you setup the following defaults (in the big box):
title=Title of your site
description=Longer generic description of your site
image=http://site.com/link-to-your-logo.jpg
JFBConnect is smart enough to use the current Title and description from the meta data on your page though, so depending on how your site is configured, or if you already have great titles and descriptions on your pages, you may just want the image tag above.
These defaults will be used on any page that you don't override them. Then, on each page you want to override them on, you can use the Open Graph easy tag in JFBConnect to set any additional data:
{JFBCGraph title=Best title for this page}
{JFBCGraph description=Specific description for this page}
etc
With these tags set, when someone Likes your page, it will show up in their wall the information you set, which is nice to have control of. Additionally, if you're on Facebook and share the URL to one of your pages, the information will automatically be sucked in.
Finally, just so you know, we don't support the actual Share button in JFBConnect. That was deprecated by Facebook earlier this year and is no longer recommended for use (and can cause problems if it is). They recommend the Like button with Open Graph tags, which we fully support.
Hope that helps get you started,
Alex