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by bsimpson63 4579 days ago
That's actually how it works. If you target an ad to /r/programming it will show up on the frontpage for users subscribed to /r/programming.
2 comments

Which probably accounts (in part) for Reddit's low conversion rates— a significant portion of the page-views will be from people not in `programming-mode', compared with almost none from HN.
Confirmed by my referral logs. This is how it works.