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Kepfeltoltes.hu is probably the most popular one-click image sharing service in Hungary. Since its start in 2004, it has hosted millions of images. However, the maintainers tend to delete old pictures after an uncertain amount of time.
Users can select files (up to 20) from their computers and upload them very easily. Then they get the URLs of their pictures, which they can insert to forums, chats or anywhere. Uploaders can decide whether their pictures shall be public, that is, appear on the list of pictures recently uploaded by users (http://kepfeltoltes.hu/public.php?ok=ok&btn_tovabb=Tov%E1bb; NSFW alert!).
Image page URLs are all unique, they are like the following: http://kepfeltoltes.hu/view/YYMMDD/FILENAME_www.kepfeltoltes.hu_.EXT, where YYMMDD is the date in this format, FILENAME is the name of the original file, EXT is the file extension (jpg/jpeg, png and gif files are accepted). The actual image URLs are like http://kepfeltoltes.hu/YYMMDD/FILENAME_www.kepfeltoltes.hu_.EXT, but those are, of course, linked from the image pages.
The way the URL is generated prevents others to find the images not made public. Thus, in the following, we talk about public pictures only.
The site lists the last 6000 uploaded public pictures on http://kepfeltoltes.hu/public.php?ok=ok&btn_tovabb=Tov%E1bb. There is no index for older pictures, and, as seen above, they can't be efficiently discovered with brute force.
Although some percent of the image corpus is NSFW content, most of the files are screenshots and photos of objects and people.
The number of public pictures grows by 3 to 5 thousand a day; more are uploaded at weekends than at weekdays.
There is no certain information about the image deletion mechanism used by the maintainers. Some people say that pictures may be deleted after some months, however, some testing shows that several years old pictures are still up. It is also said that staff removes users' uploaded pictures on request (uploader can optionally enter their email address when uploading). What is for sure that all images uploaded before September 2009 seem to be gone.
So it's unknown when and what pictures they delete, but we can assume they regularly delete some older pictures to free up space.
From 2014-11-13, user:bzc6p exports a daily index of uploaded pictures. (The last day's image URLs can be parsed from the list of last uploaded images, see above.) Later, after at least 30 days, he downloads the actual images and uploads them to the Internet Archive. (The 30-days is some kind of "deletion-by-user" window, should the uploader get their pictures be deleted soon after uploading. Not many users may do that, though. However, bzc6p respects this will. And it's not likely that kepfeltoltes.hu deletes images so quickly.)
A Google discovery is also being made for images uploaded before the indexing started. A small amount of older images can be saved that way.