[Hummingbird] Performance Test images show optimization needed

Am having some issues with asset optimization — (1) Smush Pro has been used to optimize all images in all our wordpress files but continues to tell me that 13 images need optimization. No matter how many times I run bulk optimization those same 13 images need to be optimized.

(2) Performance test shows 46 images that need optimization. Any images in wp-content have already been optimized. Others look like they're not in wp-content or within our wp structure. Not sure how I'm supposed to optimize scontent.xx.fbcdn.net or http://www.google.com or i.imgur.com or external.xx.fbcdn.net images. Please advise.