I don't think you quite understand the difference between cropping and compression. Cropping an image is the equivalent of choosing which part of the image Face

I don't think you quite understand the difference between cropping and compression. Cropping an image is the equivalent of choosing which part of the image Facebook displays as your profile picture. While this method could reduce the size of the image to transmit down to '2MP', there's really no purpose in taking photos that are essentially cut in half.