Karma Farming
A reader's summary of the practice of accumulating Reddit karma for its exchange value rather than as a byproduct of genuine participation — how an anti-spam rule turned a reputation score into a black-market commodity, and what the University of Zurich's 2025 secret persuasion-bot experiment revealed about what farmed credibility is actually worth.
The term at a glance
Karma farming is the deliberate accumulation of Reddit's upvote-based karma score through low-effort or automated means — reposting old viral content, copying top comments into fresh threads, running bot networks that upvote each other's posts — rather than through original contribution. The point is rarely the number itself; it's what the number unlocks: eligibility to post in karma-gated subreddits, an appearance of established good faith, or an account with resale value on markets outside Reddit entirely.
Origin
Reddit launched in June 2005 with upvoting and downvoting built in from the start, and karma — the running total of votes a user's posts and comments have received — as a visible reputation score from day one. For most of the site's early life karma was closer to a scoreboard than a resource: it signaled who contributed well, but it didn't gate anything. The word “farming” attached to it later, once communities began requiring a karma threshold to participate and users noticed the fastest way past that threshold wasn't writing something new — it was recycling something that had already proven it could earn votes.
History and context
The karma gate itself was a defensive move. As Reddit grew, moderators of larger subreddits started requiring a minimum combined karma and a minimum account age before a user could post or comment, specifically to filter out spam accounts, ban-evading trolls, and single-use throwaways — a rule roughly analogous to a forum requiring you to introduce yourself before posting links. The trouble is that the same threshold which blocks a disposable spam account also creates a reason to want a non-disposable one: an account old enough and upvoted enough to clear the gate is worth more than a brand-new one, which is worth nothing at all in a gated community. That gap is what turned karma into something with exchange value rather than just reputational value, and it's why farmed accounts eventually found their way onto marketplaces outside Reddit, priced by exactly the attributes moderators had chosen as their spam filter: age, karma total, and which gated communities the account qualifies for. By the mid-2020s the practice had scaled into something closer to a click farm — batches of accounts run from device racks or emulated environments, cycled through proxy networks, repost and comment automated end to end — and Reddit had responded by de-emphasizing raw karma in favor of an internal Contributor Quality Score meant to catch exactly this kind of manufactured engagement.
Main ideas
Karma was a reputation signal before it was a currency
Reddit shipped upvotes and downvotes at launch in 2005 to surface good content and give frequent contributors visible standing. Karma farming is what happens once enough downstream systems — subreddit access, credibility, resale value — start treating that visible number as something worth acquiring for its own sake, independent of the posts that originally earned it.
The anti-spam gate created the market it was built to stop
Moderators started requiring minimum karma and account age to post specifically to keep spam and throwaway trolls out. That gate is exactly what gives a karma-heavy account resale value: a fresh account can't post spam links into a gated subreddit, but a farmed one with months of history can, which turned the defense into the incentive.
Reposting is the classic low-effort method
The simplest farming technique is republishing content that already went viral once — an old top post, a screenshotted joke, a comment copied from a previous thread — timed for a moment when the original has scrolled out of most users' memory. It costs the farmer nothing but produces the same upvote response a genuinely new post would.
It industrialized into an account marketplace
Farmed accounts get sold on marketplaces outside Reddit, priced by age, karma total, and which gated subreddits they're eligible to post in — reporting has put figures anywhere from a few dollars to several hundred per account. The buyer isn't after the karma as a number; they're after the posting privileges and the appearance of an established, trustworthy user that the number implies.
Reddit's own countermeasure concedes the number is gameable
Reddit has increasingly pushed subreddit moderators toward its Contributor Quality Score, an internal measure of authentic engagement, specifically because raw karma had become too easy to manufacture to serve as a trust signal on its own — an implicit admission that the platform's original reputation metric no longer means what it was built to mean.
The 2025 Zurich experiment showed what farmed credibility buys
Researchers from the University of Zurich secretly ran AI accounts on r/ChangeMyView from November 2024 to March 2025, posting under fabricated personas — including a rape survivor and a trauma counselor — and accumulated more than 10,000 comment karma across roughly 1,700 comments. The bots won over 100 of the subreddit's "delta" awards for changing someone's mind and were measured as roughly six times more persuasive than human commenters, a result the researchers themselves called disturbing.
Critique
- Intent is not visible from the outside. A repost can be lazy engagement bait or it can be a genuine attempt to share something with an audience that missed it the first time — the same action reads as farming or as ordinary participation depending on a motive nobody outside the account can confirm.
- The gate that causes it also does real work. Karma and account-age minimums measurably reduce spam and ban-evasion, which is why moderators keep using them despite knowing they create a farming incentive — removing the gate entirely would trade a gameable filter for no filter at all.
- Farmed credibility is a general-purpose tool, not a niche exploit. The same aged, high-karma account works equally well for a spam link, a political astroturfing campaign (compare astroturfing), a research experiment, or nothing more sinister than a marketer skipping the trust-building step — the market doesn't distinguish buyers by their motive, only by their willingness to pay.
- Quality-score replacements aren't transparent either. Reddit's move to an internal Contributor Quality Score addresses the gameability of a public number by replacing it with a private one whose exact inputs users can't see or contest, which trades one kind of opacity for another.
Impact
The clearest recent demonstration of what farmed credibility buys wasn't a spam operation at all. Between November 2024 and March 2025, researchers from the University of Zurich secretly deployed AI accounts on r/ChangeMyView under fabricated personas, building over 10,000 comment karma and winning more than 100 “delta” awards — the subreddit's own marker for a comment that successfully changed someone's mind — while measuring their comments as roughly six times more persuasive than the median human response. Moderators only learned of the experiment after it concluded, condemned it as unauthorized manipulation of unconsenting users, and Reddit's Chief Legal Officer called it “deeply wrong on both a moral and legal level.” Whatever the researchers' intent, the mechanics were the same ones the account marketplaces run on: an unremarkable-looking account accumulates a track record, and that track record — not the substance of any single post — is what makes the audience lower its guard. It's the same trust-by-volume logic behind glazing and love-bombing: a sustained pattern of engagement standing in for evidence the engagement was ever sincere.
Notable engagements
- Reddit launch (June 2005) — introduced upvotes, downvotes, and karma as a built-in reputation score from the platform's first version.
- TechCrunch, “Reddit has banned 944 accounts linked to the IRA Russian troll farm” (April 2018) — an early, politically-motivated example of aged accounts being cultivated at scale for influence rather than organic participation.
- University of Zurich r/ChangeMyView experiment (November 2024 – March 2025, revealed April 2025) — undisclosed AI personas farmed karma and delta awards while testing AI persuasion against human debaters, prompting a moderator complaint and a legal response from Reddit.
- Reddit Contributor Quality Score (ongoing) — the platform's internal alternative to raw karma, offered to moderators specifically because karma alone had become too easy to manufacture.