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Seems they had no security at all (just a random 5 character hash)..

Reddit users are seemingly busy sharing nsfw pictures and linking them to facebook accounts, will probably result in a couple of suicides when all is said and done :(

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A random hash is actually fine -- the problem is that they are using only 5 characters. Had the programmers decided to go with a single additional character, this vulnerability would be much, much less severe. If they chose seven characters, it would be difficult to even grab a single random image. Ten characters, and it would take half a century per image.

Do not confuse Reddit and 4chan.

Well... sometimes the only difference seems to be that you cannot attach pictures to your comments. (still - depends on the subreddit)

The reddit thread contained many direct links to photos, and compressed archives of several thousand photos. Some of the archives contained NSFW photos of girls of very questionable age. Reddit and 4chan may be different sites, but there is a significant cross over of users (both literally, and in the "type of users" sense).

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