I just came across a tool from Facebook that helps you debug your Open Graph data.
The Facebook Debugger tool provides valuable insight into exactly how Facebook sees your webpage.
- Fix warnings about improper usage of Open Graph <meta> tags
- View all thumbnail images Facebook sees for that page
- View all Open Graph tags, including:
- See exactly what Facebook’s scraper sees for your URL
When sharing a link on Facebook… if you’re having trouble with the thumbnail images being displayed, the page title or description, give this debug tool a shot. It might lead you to correct the issue.
You might want to check out how to add multiple thumbnail images when sharing a Facebook post.