You may have run into the issue of trying to find someone using Graph Search, only to discover you can’t quite make out their identity via their teeny-tiny profile picture. If said user has set their photo to private (in other words, if they’ve set it to be visible only ‘to me’), you won’t be able to see the full-sized photo.
With this trick, you will be able to view any profile picture as full-sized, regardless of whether or not it’s marked as private.
1. Go to the profile picture you’d like to see and open it in a new tab or window (on Mac, Ctrl-Click and then ‘Open Image in New Tab’, on PC, right click and then ‘Open Image in New Tab’).
2. Go to new tab or window, to the address bar. You should see a portion of the url that looks something like this:
3. Remove the ‘s160x160’, and hit enter.
Voila! You should see the full sized image in your browser. Note that if the original picture was small, this trick won’t do you much good!