What do you call an old joke which someone has put on r/jokes ?

A historepost.

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What do you call an old joke which someone has put on r/jokes ?

A historepost.

What's the difference between an old joke and a new one?

Nothing. We're on reddit

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How many redditors does it take to post a joke to /r/Jokes?

Three. One to post it, another to post a better punchline in the comment section, and another to repost it with the new punchline.

What do you call a crappy joke on /r/Jokes?

sub-standard.