You can Goggle a picture if you have your doubts and want to trace its origin back. Just save the picture and past it on the Google image search tool. It won't trace back FaceApp processed ones, but actual GG pictures have a good chance to pop.
I also observe that pictures are far from being the only things that get embellished on this site Good candidates for the Writers' section seem to accidentally end up in the MTF section from time to time...