After falling foul of Apple’s slightly suspicious boob aversion which they claim is on the grounds of taste and decency but which makes you doubt their claimed love of beauty, it appears that the 500px app is back on the App Store, with a minor update.
The only slight reference to the app’s disappearance is in the update notes; the main noticeable change is a ‘report image’ button which can be used by people if they feel an image is inappropriate – and would then presumably spark a debate over the exact difference between boobs as art and boobs as porn.