Except that in PhotoPost, much more information is displayed about a photo. It's difficult to use ajax to scan photos with pretty much the entire page has to be updated to reflect the new image. That's the challenge in trying to do that.
__________________ Please do not PM me for support or sales questions. Thank you for your understanding.
Just an FYI things that facebook develops in house to use only have to work with there setup/servers you can not compare to our products directly. It is a nice idea but anything we implement would have to work in all server environments which is the root of all issues there plus what Michael has pointed out above.
On a personal note I do not like the new facebook picture viewer thing. I preferred the old way they did things.