I've put this into our issue tracker to add in a future release, but in the meantime if you update the following code, it should get you going on Joomla 3.x.Also, is there an easy way to delete all activity in the open graph error logs? I don't see a select all or delete all option and I have over 14 pages of logs in there.
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<th><?php echo JHtml::_('grid.checkall'); ?></th>
$image = $album->getCoverThumbPath();
$imageUrl = CRoute::getExternalURL($image);
$this->addOpenGraphTag('image', $imageUrl, false);
$image = $album->getCoverThumbPath();
$uri = JURI::getInstance();
$base = $uri->toString(array('scheme', 'host', 'port'));
if(strpos($image, $base) === false)
$image = CRoute::getExternalURL($image);
$this->addOpenGraphTag('image', $image, false);
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