Bosse,
Gotcha. You can try the following change, which I believe will fix the issue you're seeing. In the /components/com_jfbconnect/controllers/social.php file, around line 30, you'll see a line like: $href = JRequest::getVar('href'); Directly below that line, add::
$href = urlencode($href);
That will hopefully fix it for Comments. To fix for Like's, look for the same line of code at around line 55 and do the same thing.
Please let us know if that helps, and if so, we'll definitely add it into the next release.
Thanks,
Alex