I did something I had not even thought of doing yesterday.
I had loaded this photo to my facebook page, the exact same JPG file as is in my AP thread.
Whilst with friends yesterday, one of my friends asked if they could put a copy on their website, a blog, and I agreed. As they had it open on FB, they right clicked it and used the save image as option, to download it
Then I noticed!
The file on AP is 243KB (as uploaded), and if it is downloaded from AP, it is 243kb. But the copy my friend grabbed off FB is 65.1kb. Now I get that some compression is going to happen, but that level of compression is really going to start affecting the 'viewable' qualities of the photo, as I, the photographer intended it to be, as a web uploaded file.
Certainly I knew FB compressed photos that were uploaded, but really did not know how much they did so.
If you are using FB to host your photos and link to other sites, think again, you are losing so much quality due to FB's compression handling of your images that it really is not a good choice.