Facebook has tweaked the way that users can adjust the thumbnail version of their profile photo - the tiny square image that represents them next to comments on the site.
When hovering over your profile photo and clicking the pencil icon, then Edit Thumbnail, a 'Scale to fit' option (above) used to appear.\
Now, however, Facebook allows you to upload a profile image and (as long as it is over 180 x 180 pixels big), drag it around to pick the thumbnail view you like the best.
The previous 'Scale to fit' option was causing a few issues with images being cropped all weird in certain cases, so hopefully this tweak will have straightened everything out. All this said, though, I would always recommend uploading a big, square profile photo to bypass the need for any of this editing in the first place.
Andrew Macarthy is the author of the #1 Amazon Web Marketing Bestseller, 500 Social Media Marketing Tips, available for Kindle and in paperback.