I have a website with some Facebook "Share" buttons. The Facebook "Share" button was working properly until a few days. I haven't touch the code in the meantime. Now, I get a notification "Not found- back to Facebook", each time I click on the share button in my website.
Here is an example of a link for sharing:
Thank you for your help as I really don't see the problem.
I searched but I've seen nowhere that Facebook has changed the attributes of the shared links lately so I really don't know what should be done.