Stop facebook from taking the avatar picture when sharing an item

Hi!
Is there some way of code I can use to stop facebook to take the avatar or user photo as the item picture when sharing a ad om facebook?
I currently have inserter the og: string in the head area so that facebook takes a special picture that I have decided, but it would be much better if the picture was of the item that is shared.
When running the head section as it was, facebook always took the avatar picture as the item picture 🙁