Illustration showcasing the location of a Facebook shared image.

[shaownhasan]

The left side of your cover photo will be covered by your profile picture. On mobile, it could be 75% of your profile picture will overlap into the cover photo.
Images with a logo or text may be best as a PNG file
Business Page dimensions are exactly the same as personal accounts.
Facebook Shared Image
A shared image is one of the most common canada business email list forms of sharing on Facebook. These images will always appear on your timeline, and ideally they will show up in most of your followers’ News Feeds — though with the Facebook algorithm determining which content will be served, it’s unlikely that everyone will see your post. The more people engage with your post, the more likely it is that the rest of your followers and their followers will see that activity.

Facebook shared image guidelines

Recommended image size: 1080×1350 pixels
Maximum file size: 8MB
Recommended file type: JPG, PNG, GIF
Appears in feed at a max width of 470 pixels (will scale to a max of 1:1)
Appears on page at a max width of 504 pixels (will scale to a max of 1:1)
Sprout Guidelines:

Same as above, except:
Max number of images per post: 10 in Sprout
Facebook Shared Link
Illustration showcasing the location of a Facebook shared link image.
Another great tool in your Facebook belt is the ability to share a link. It’s very similar to posting a shared image, but it gives you even more fields to work with. You can choose to create a shared link with a small square image to the left and text on the right, or with a larger rectangular image on top with text underneath.