Sharing images: 1200 x 628 pixels
Sharing links with an image: 1200 x 628 pixels
Sharing Stories: 1080 x 1920 pixels
Sharing square images: 1080 x 1080 pixels
Sharing horizontal images: 1080 x 566 pixels
Sharing vertical images: 1080 x 1350 pixels
Sharing Stories: 1080 x 1920 pixels
Sharing a single image: 1200 x 675 pixels
Sharing multiple images: 1200 x 675 pixels
Sharing links with an image: 800 x 418 pixels
Sharing images: 800 x 1,200 pixels
Sharing images to Company Page or personal profile: 1104 x 736 pixels
Sharing links with an image to Company Page or personal profile: 1200 x 628 pixels
Google+
Sharing images or links with an image: 1200 x 628 pixels
Snapchat
Sharing images: 1080 x 1920 pixels