There's a few issues that are causing your problem. First, the private message you sent me had a link to the following page:
/online-kurs/inspirasjon/item/7-video-5-jeg-er-rolig
That page is for registered users only, as I'm redirected to:
/component/users/?view=login
On that page though, I get the following PHP error:
Fatal error: Call to a member function get() on a non-object in /home/kultuurc/public_html/heart/templates/<YOUR_TEMPLATE>/index.php on line 8
That's not related to JFBConnect, just wanted to let you know.
However, the overall issue relates to the fact that the page is for registered users. Facebook has a search 'bot' that scans your pages for the Open Graph tags. Since your page is redirecting the 'bot' to the login page, that's what Facebook is seeing. Since that page has an error, it's not able to see any Open Graph tags. So, you'll need to:
1) Fix that error on the login page. I'm not sure what's causing that.
2) You may want to not make your K2 content for registered users only, if possible. Like that, Facebook won't be able to scan and see the contents of your registered pages. We're investigating a way to let Facebook 'peek' into registered content pages, but for now, it's just not possible.
Hope that helps explain the issues,
Alex