Hey Danny,
What I did is turn off the lock down mode from backend > Easysocial > settings > general > lock down mode - NO (You can refer on my attached screenshot below) as my colleague already mentioned at above.
After that copy that stream URL into
Facebook debugger tool and click on `Debug` button, When you reach inside the debugger result page, you have to press "Scrape Again" button until Facebook retrieve correct content and image from your stream item.