BeautyMeter, a free app from German developer Braun Software GmbH - Sophistes, had users voting on the assets of men and women in terms of their face, body, and clothes. All these photos had to be approved by the developer to show up for others to vote. The only problem with this is that there appeared to be no actual filtering going on, and naked photos managed to make it on through. Including those of people who were under the age of 18, which meant that the app was breaking the law in several countries.
The app was quickly pulled, however Braun bounced back with a retooled version called Girls and Boys that basically does the same thing, sans the underage nudity of course.