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"Stories have fallen off the front page sharply despite doing well" is an instance of flagging overcompensation, not punishment for vote rigging.

Also, some domains have been penalized, which is why some articles fail to make the front page even with many votes on r/newest (e.g. medium.com)

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Why are some domains penalized? Just curious.

Usually domains with a high submission quantity of typically low quantity content. (imgur.com, quora.com, qz.com.) However, higher-quality domains such as github.com and arstechnica.com get penalized as an offset to the fact that duplicate submissions result in upvotes.

See the full list at: http://www.righto.com/2013/11/how-hacker-news-ranking-really...

> However, higher-quality domains such as github.com and arstechnica.com get penalized as an offset to the fact that duplicate submissions result in upvotes.

I've never understood that. Submitting content IS upvoting content. Clearly if I'm willing to take the time to submit content I want to upvote it. I'd personally think that multiple submissions of the same thing should get a bonus, not a penalty.

That might be a problem if spambots are involved, though.

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