Facebook takes its best guess when it comes to adding a thumbnail into your embedded links on your channel but sometimes it doesn't get it right. However, there is a way to select the image you want displaying on your post!
- Select the edit button of the post.
- Remove the link.
- Paste it into the post again.
- You should now be presented with a "left/right" arrow on the window which allows you to scroll through the images on the page until you find the one you want to display.
- Simply select the one you want and click "save".