Peter,
You won't get anything in your Activity Log unless you're trying to create actions, like posting to a user's Timeline whenever they read or vote on an article, or upload an image in JomSocial, etc.
The Open Graph tags are what describe your page, and just enabling the plugin should automatically set that for you. You don't need to create the "Objects" or "Actions unless you want to post things in the user's Timeline. If just enabling the K2 plugin isn't setting your open graph (title, description, image) as you'd expect, please try the following:
* Run your page through the Facebook Debug Tool. Check what the data is that Facebook is seeing for your page:
developers.facebook.com/tools/debug
* Post, or Private Message, us the URL of a page from your site that doesn't have the right tags set. We'll gladly look into it further for you.
Paul,
Once you create the "you <action> a <object>" settings in your Facebook App, you need to setup the Object and Action in JFBConnect that corresponds to each of the settings you created in your app. Our guide should step you through the process:
www.sourcecoast.com/jfbconnect-test/open-graph-actions
If you have any questions just let us know!
Thanks,
Alex