I tend to stick to postimages.org though they sometimes have domain issues and some of my older posts have been rendered pictureless.
imgur.com. Image-hosting side of reddit.
Huh. I was using imgur but now that I know it’s reddit I think I won’t anymore. 😛
Imgur has identical “/r/” subreddits to Reddit. Images posted on a Reddit subreddit also appear on the corresponding one in Imgur. But Imgur also has a community independent to Reddit, and often makes fun of made-for-Reddit images. For example, if someone posts an upvote or downvote gif in Imgur’s Usersub and the arrow is respectively colored red/blue (Reddit) instead of green/red (Imgur), the Imgur community often mocks it for being the wrong color.
Just kidding, I didn’t read that.