What is a "hivemind," and why do some users complain about it?

The hivemind refers to the tendency for large Reddit communities to converge on a single dominant opinion and then enforce it through upvotes, downvotes, and social pressure, producing what looks like consensus but is often just the loudest faction winning. The term comes from science fiction — the idea of individual consciousnesses merged into a single collective intelligence — and is used on Reddit to describe how the voting system can make a platform appear to "think" uniformly even when the underlying population is diverse. Users who complain about the hivemind are usually noticing that Reddit's ranking algorithms surface early high-upvote comments and bury later comments, regardless of merit. If an opinion gets ten quick upvotes before critical responses arrive, it accumulates visibility, which brings more upvotes, which brings more visibility — a feedback loop that has nothing to do with the comment's accuracy or insight. By the time a well-reasoned counterpoint appears, it is already invisible because the thread's social momentum has locked in. The hivemind complaint is particularly acute in politically or socially charged subreddits, where nuance is costly and simple affirmation is rewarded. A comment that says "yes, exactly, this is outrageous" will outperform a comment that says "this is complicated and the other side has a point" because the former requires no cognitive work to upvote. Over time, communities can develop reputations for being intellectually narrow even though they contain members with a full range of views. Not everyone who criticizes the hivemind is right. Sometimes "hivemind" is invoked by people whose contrarian opinions were correctly downvoted as factually wrong or harmful. The complaint carries more weight when applied to aesthetic or political opinions where no single correct answer exists, and less weight when applied to scientific or factual questions where communities appropriately push back on misinformation.