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[–] MaunaLoona 0 points 2 points (+2|-0) ago 

np links are a hack created by redditors and used by reddit mods. They are not endorsed by reddit admins.

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[–] 904239? ago 

Yep. Wasn't going to delve into the details. Figured it wasn't super important.

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[–] Konk 0 points 2 points (+2|-0) ago 

Take it as you will that they want to discourage participation in threads from people outside of given subreddits.

This is the biggest take away from reddit. You can get banned for regular usage just because you happened to be linked from another subreddit.