What are the most common reasons people downvote posts on Reddit, and how do these norms vary across different communiti

What the downvote button is supposed to do

Downvotes are meant for content that is rule-breaking, off-topic, or non-contributing, and downvoted content sinks in sorting [3][33]. A commonly taught community norm is to use the downvote button when a post breaks a subreddit rule or hinders discussion [29]. Downvotes are also described as a signal of disapproval or low quality [7].

Why people actually downvote in practice

• Many users treat downvoting as a way to remove content they disagree with, like a "censor this post" button [14]. Some users even argue the downvote button should be used when you disagree [28].
• Official Reddiquette says users should not downvote an otherwise acceptable post just because they personally dislike it [5][23], and should not mass-downvote someone else's posts [6][24]. The fact that these rules exist suggests both behaviors are common enough to need discouraging.
• Strategic downvoting happens too, including spammers trying to improve their own ranking and trolls downvoting for fun [15].
• "Stalker" downvoting is a pattern where someone retaliates against another user by downvoting that user's contributions en masse [16].
• Early votes can create a bandwagon effect: if the first few voters downvote a post, it tends to receive more downvotes, while early upvotes tend to attract more upvotes [20].
• Users frequently report being downvoted for no visible reason when asking for help, addressing points in a discussion, sharing an opinion, posting ordinary content, or when the voter is not directly affected by the post [1][2][30][31].
• Low-value promotional content is a common downvote target, including thinly disguised ads posted as "questions" [8][9].
• Not all apparent downvotes are real. Reddit deliberately skews or "fuzzes" vote counts to confuse bots and as spam prevention, so some displayed downvotes may be fake [18][19][32]. Reddit also does not register votes made from a user's profile page, partly to reduce stalker downvoting [22].
• Research on actual behavior found that most users do not read the article they vote on — 73% of posts were rated without first viewing the article [34]. Another study recorded the clicking, browsing, and voting behavior of 186 Reddit users over a year [35].

The evidence does not provide a strict popularity ranking of these reasons, but these patterns are the ones described across the sources.

How downvote norms vary between communities

Downvoting is a system with a precedent of punishing people who do not conform to the social norms of a particular subreddit [4]. In other words, the same comment can be fine in one community and heavily downvoted in another.

• Each subreddit has a different character depending on its moderators and the community it attracts, and what gets upvoted or downvoted depends on the format, tone, and topics expected in that subreddit [11][12].
• In discipline-focused subreddits such as AskHistorians, users can be downvoted just for asking a question, let alone answering one [13].
• Perceived standards differ by area too: commenters in one discussion said standards might be lower in politics sections than in programming sections [17], and noted that a 51% voting majority in the politics subreddit could skew the front page toward one political viewpoint [21].
• Communities also teach their own downvote etiquette. For example, one commenter described it as: upvote if you agree, do not upvote if you disagree, and downvote only if the comment is pointless, rude, obnoxious, or incorrect [26].
• In another subreddit, a reminder told users not to upvote or downvote based just on who posted, meaning voting based on the poster rather than the content is considered bad etiquette there [27].
• Reddit's voting system is community-driven: upvotes raise content, downvotes bury it, and the community collectively decides what content is worth seeing [10]. Because each community has its own standards, that collective decision looks different from subreddit to subreddit.