My post disappeared! Where'd it go?

    Threads expire and are pruned by 4chan's software at a relatively high
rate. Since most boards are limited to eleven pages, content is usually
available for only a few days before it is removed. Most times, the post was
probably flagged as old and marked for deletion automatically, however in some
cases it may have been removed by moderator or janitor. We ask that users
refrain from reposting material that they believe to have been deleted by the
staff.

Can I retrieve an old post/image?

    No. Content that expires is removed from our system entirely. Archives are
not available. Please do not e-mail us requesting content that has been
pruned, for it is impossible for us to assist you. Instead, try placing a
request on the /r/ board.

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4chan. I still don't get it.