PROBLEM WITH IMAGE OF LIKE

To specify the image you want used when the Like is clicked, you need to use Open Graph tags. Open Graph integration in JFBConnect is enabled by default, but you can check the setting in the Social Configuration -> Open Graph tab. Then, all you need to do is add the following tag to your article to specify the image you want used:
{JFBCGraph image=http://site.com/link-to-image.jpg}
It will take Facebook 24-48 hours to update the image for new like's, so if you try right away, you may not see a difference. You can use the debug tool to see what Facebook 'sees' on your page from the Open Graph tags:
developers.facebook.com/tools/debug

Finally, you can also use the Open Graph tab in the social configuration area to specify a default image, in case you haven't explicitly set one on a page using the tag above. This is good for using your logo or something, just to make sure some random image isn't shown. To do so, add the following tag into the defaults box:
image=http://site.com/good-default-image.jpg

Hope that helps,
Alex

That setting should work on any Joomla or K2 articles. If that's not the type of page, then you'd need to specify it manually.

Can you post (or Private Message) me a link to the page with the problems?

Thanks,
Alex

That setting should work. What kind of view are you in? Article view, blog view, etc? If it's not working for you, please post a URL of the page so we can take a look.

Also, you can use Facebook's URL debug tool to see if there are any issues that show up on your page, and it should also show you the image it's choosing and why:
developers.facebook.com/tools/debug

Good luck,
Alex

Marcus,
The "Use First Image" setting of JFBConnect currently only uses the first image actually inserted into an article. With the way that Joomla Content plugins work, we're unable to 'see' a K2 Image specified for an article if it's not actually in the article text. This is something we're looking into making work in a future release, but for now, if you're using the "Image" tab in a K2 article, it will not be detected by the JFBCContent plugin. In this case, you will need to explicitly set the article image using the {JFBCGraph image=http://www.xxx.com/image.jpg}

Hope that helps explain why it may not be working,
Alex