Reddit Basics: Subreddits, Karma, Sorting, and Bans Explained

Reddit looks simple until you post something and it vanishes without explanation. Then the questions start: what actually controls what you see, why did my post disappear, and what's the difference between all the ways you can get banned? This guide covers the core mechanics, the moderation layer, and the failure modes, in plain terms.

Subreddits: the basic unit of Reddit

A subreddit is a topic-based community with its own rules, its own moderators, and its own culture. The site is really thousands of small forums sharing one login and one voting system. Nothing you learn in one subreddit transfers automatically: a post format that works in one community can be a bannable offense in the next. Before posting anywhere, read the sidebar rules and sort the sub by Top of all time to see what its members actually reward.

Subreddits can be public, restricted (anyone can read, only approved users can post), or private (invite-only). Some also require minimum karma or account age to post, and those thresholds are almost never published.

Upvotes, downvotes, and how sorting works

Every post and comment can be upvoted or downvoted. The score you see is votes up minus votes down, and Reddit deliberately fuzzes the displayed number to make vote manipulation harder, so don't obsess over exact counts.

The sort you choose changes everything about what you see:

• Hot — the default. Balances score against age, so newer posts with fast early votes beat older posts with bigger totals. The first hour of a post's life largely decides its fate here.
• New — pure chronological order. This is where posts live before anyone votes, and where dedicated users of small subs actually browse.
• Top — highest score within a time window (hour, day, week, month, year, all time). Useful for research, useless for discovery of fresh content.
• Rising — posts that are gaining votes unusually fast for their age. A preview of what's about to hit Hot.

Practical takeaway: if your post gets no traction in the first hour on New, it will almost never recover. Timing your post for when the sub's audience is awake matters more than most people think.

Karma: post vs comment

Karma is the running total of upvotes your account has earned, tracked separately for posts and comments. It's a rough reputation score, not currency. You can't spend it, but it matters because many subreddits use minimum karma thresholds as spam filters. An account with zero comment karma that only submits links looks like a bot, and AutoModerator in many subs treats it like one.

Comment karma is the easier and safer kind to build: leave genuinely useful comments in large subs and it accumulates. Post karma comes from submissions. If you're building a new account, get some comment karma first before you start posting.

Awards are gone (mostly legacy)

If you read older guides mentioning Reddit Gold, Platinum, or the award system, know that the old awards ecosystem was shut down. Reddit has since experimented with replacement award features, but the classic gilding system that older posts and screenshots reference no longer exists in that form. Don't build any strategy around awards.

Flairs: post and user

There are two kinds and they're unrelated:

• Post flair is a tag on a submission ("Discussion", "OC", "Question"). Many subreddits require it, and AutoModerator will silently remove unflaired posts in those subs. Always check whether flair is mandatory.
• User flair is a label next to your username within one specific subreddit. In some communities it's decorative; in others (verification-based subs especially) it signals status that mods have granted, and posting without it isn't allowed.

Crossposting

Crossposting shares an existing post into another subreddit with a link back to the original. It's faster than reposting and keeps attribution, but two caveats: some subreddits disable incoming crossposts entirely, and some ban crossposting in their rules even when the button works. When in doubt, a fresh native post tailored to each sub's rules performs better than a lazy crosspost anyway.

NSFW marking

Any post with adult content must be tagged NSFW. This blurs the preview and hides it from users who haven't enabled adult content in their settings. Failing to tag NSFW content is one of the fastest ways to get banned from a subreddit, and repeat offenses attract admin attention. Accounts that mostly post adult content should also mark their entire profile as NSFW in account settings. Note that NSFW posts are excluded from some feeds and search surfaces, which is a reach trade-off you accept, not a bug.

Cake day

Your cake day is the anniversary of your account's creation, shown as a small cake icon next to your username for that day. It has no mechanical effect, though posts mentioning it often get sympathy upvotes. That's the entire feature.

Moderators vs admins, and AutoModerator

This distinction matters when something goes wrong:

• Moderators are volunteers who run individual subreddits. They can remove your posts and ban you from their sub, and nothing else. Their power ends at the subreddit border.
• Admins are Reddit employees. They enforce sitewide rules and can suspend or shadowban your entire account across all of Reddit.
• AutoModerator is a bot that mods configure with rules: minimum karma, account age, banned words, required flair, link filters. A huge share of "my post disappeared instantly" cases are AutoMod, not a human decision. Its rules are per-subreddit and almost never public.

Why posts get removed

The common causes, roughly in order of likelihood: AutoMod filtered you for low karma or account age; you broke a sub rule (missing flair, wrong post type, banned link domain); Reddit's sitewide spam filter caught you; or a human mod removed it manually. The frustrating part is that removed posts often still look live to you. Check by opening your post in a private browser window while logged out — if it's not visible, it was removed. Politely messaging the mods via modmail sometimes gets a filtered post restored.

Shadowban vs suspension vs subreddit ban

These get confused constantly, so plainly:

• Subreddit ban — one sub's mods banned you from that sub only. You get a message, and the rest of Reddit is unaffected. Sometimes appealable via modmail; arguing rarely helps.
• Suspension — an admin action against your whole account, either temporary or permanent. You're notified, and while suspended you can't post or comment anywhere.
• Shadowban — an admin-level ban where nobody tells you. Your account works normally from your side, but everything you post is invisible to everyone else. Test it the same way as a removed post: log out and look for your content. Shadowbans usually hit accounts flagged for spam-like behavior, which is why aggressive self-promotion is risky.

Multireddits and following users

A multireddit (custom feed) is a personal bundle of subreddits merged into one feed. It's the best tool for monitoring a niche: group all related communities into one multi and browse it by New. You can make multireddits public and share the link.

Following a user subscribes you to their profile posts, which appear in your home feed. For creators, follower count matters because profile posts reach followers directly without any subreddit's rules in the way. Your profile at reddit.com/user/yourname effectively acts as your own personal subreddit.

FAQ

How much karma do I need before posting?

There's no universal number, and subreddits don't publish their thresholds. As a practical baseline, an account with some age and modest comment karma clears most AutoMod filters. Build comment karma in large general subs before posting in strict ones.

My post shows up for me but gets zero votes. Am I shadowbanned?

Maybe, but check the simpler explanation first: open the post while logged out. If it's visible, you're not shadowbanned or filtered; your post just didn't land. If it's invisible, it was either removed by that sub's filters (message the mods) or your account is shadowbanned (appeal to Reddit admins).

Does deleting a downvoted post protect my karma?

Deleting a post doesn't restore karma already lost, but it stops further downvotes and removes the post from your visible history. For accounts that depend on looking credible, pruning heavily downvoted posts is reasonable.

Can moderators see who downvoted them or shadowban me?

No on both. Vote records are private to Reddit, and shadowbans are admin-only. What mods can do is quietly remove everything you post in their sub via AutoMod rules, which feels similar from your side but only applies within that one community.