Who uses it and can even know what you are doing and everything. My friend used the iMac and the iPhoto app activated by itself in the background it was auto taking pictures as if it were sending it to some master server or something in the Apple Store. Has anyone experienced that ? Tricky Apple... That's kinda messed up...
I highly doubt that apple is collecting everyones selfies and storing them on their "master servers" I know the phones and pc's in stores are sometimes in a 'Demo' mode showing off their features including the cameras, so thats probably what you may be experiencing in which case the pictures are deleted
I believe this has to do with NSA. Your home server keeps track of everything you do on your computer, sites you visit, etc. In anything was in question, the authorities know where to track you. If you were planning on something suspicious and decided to do your research at the Apple store, how would they know who visited that site, unless they take a photo of you prior.