Facebook has made changes again to image and photo sizes. Here is the newest information from the Have Camera Will Travel website. Check it out for full details.
Below is a summary cheat sheet of the dimensions of photos and images.
|Profile Image in Header||160px||160px||Must be uploaded at 180px by 180px|
|Profile Image on Timeline||32px||32px||Same image as main Profile Image, automatically downscaled|
|Thumbnail for Shared Links||155px||114px|
|Uploaded Timeline Photo Thumbnail||403px||403px||See exceptions above for small images.|
|Video Preview Thumbnail||403px||226px|
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