I wish more people realized that virtually any subreddit for a company or product is run by the company - either directly or via a firm that specializes in 'sentiment analysis and management' or whatever the marketdroids call it these days. Even if they don't remove posts via moderation, they'll just hammer it with downvotes from sockpuppet accounts.

HN goes a step further. It has a function that allows moderators to kill or boost a post by subtracting or adding a large amount to the post's score. HN is primarily a place for Y Combinator to hype their latest venture, and a "safe" place for other startups and tech companies.