The embattled photo sharing service 500px has returned to the App Store after being pulled last week due to concerns over adult content. The app carries the same 17+ age rating that all internet-capable apps are required to carry, but now features a new reporting feature to quickly flag inappropriate content for removal. But as TechCrunch points out, the app still features a separate section for nude photography, as long as you're logged in.
Perhaps Apple was so distracted by Vine's