Reddit Announces 'Pressiquette' Guidelines for Journalists

Reddit now has guidelines for journalists who wants to source, link, quote or use its public forum for news content. Want to use an image or source a Redditor? You’ll need to get permission.

You now need to get permission for use and attribution:

If you see an interesting story or photo on reddit, message the redditor who shared the piece to ask for their permission prior to using it in an article or list, ask how they would like it to be attributed, and provide them a deadline before you move on to another story.