About r/YouShouldKnow
Community guide
r/YouShouldKnow (#152, about 5.6 million) shares practical facts people ‘should know’—useful knowledge posts, not meme dumps. Collected rules cover Post MUST begin with YSK and have appropriate flair. Post must be a YSK as defined below; In the text body of your post, you must include "Why YSK:" followed by an explanation; YSKs regarding Reddit, Facebook, Twitter or any other social media are NOT ALLOWED; YSKs with referral links to sites such as Dropbox or Amazon are NOT ALLOWED. Sample ~4.1 ppd (33 posts). Sample mix: text:33.
Fit
Useful-knowledge posts. Rules: Post MUST begin with YSK and have appropriate flair. Post must be a YSK as defined below.; In the text body of your post, you must include "Why YSK:" followed by an explanation.; YSKs regarding Reddit, Facebook, Twitter or any other social media are NOT ALLOWED.; YSKs with referral links to sites such as Dropbox or Amazon are NOT ALLOWED.; Ideas or concepts based in conspiracy will be removed at the discretion of the moderators.; Political posts / Call to arms / support for charities, orgs or political parties not allowed; No spam or self promotion.; YSKs regarding computer shortcuts are not allowed.; Citations are required for YSKs regarding health and science related topics.; Don't shitpost. Be civil - Remember the human.. Sample ~4.1 ppd.
Versus lifehacks
lifehacks overlaps on tips; YSK’s framing is ‘you should know’ facts—check each sub’s rules before assuming duplicates are welcome.
Practical pointers
Follow title/format rules; treat medical/legal claims carefully if rules restrict them.
SubMouse Editorial
The community was created on Oct 7, 2009, which makes it 17 years old. Since Oct 26, 2026, it has gained 2,270 subscribers (+0.04%). It sits just behind r/TikTokCringe (#151) and ahead of r/camping (#153) in our ranking.
What sets r/YouShouldKnow apart
r/YouShouldKnow is far more text-driven than most big subreddits: 100% of its recent posts are text posts, against a median of 34% across the Top 100. It is a discussion-heavy community, with about 29.3 comments per post over its lifetime versus a Top 100 median of 13.6. Relative to its huge audience, posting is calm — around 0.7 new posts a day per million members, which puts it in the quietest fifth of the Top 100. A good post has less competition here.
Subscriber growth
Between Sep 19, 2026 and Nov 2, 2026, r/YouShouldKnow went up from 5,631,838 to 5,642,937 subscribers (+11.1K, +0.20%). That is about 252 new members per day. The chart uses our weekly snapshots (9 so far), so it gets longer every week.
What r/YouShouldKnow talks about
Across 33 recent posts (Oct 29–Nov 4), the words that come up most are “ysk”, “google”, “shopping”, “sodastream” and “headquartered”. Other frequent themes are local, correctly, commonly, confused, words and contractions. Recurring phrases include “ysk google”, “google shopping”, “commonly confused” and “confused words”. By format, 100% are text posts.
Popular post flairs: Technology (9), Other (8), Education (7), Food & Drink (3), Finance (1), Health & Sciences (1).
Activity and best time to post
r/YouShouldKnow gets about 4.1 new posts a day. The public archive holds 111,718 posts and 3,276,630 comments in total, about 29.3 comments per post. Last week the busiest day was Tuesday (7 posts) and the quietest was Sunday (1). Posting peaks around 22:00 UTC and is lowest around 00:00 UTC.
Rules of r/YouShouldKnow
The moderators of r/YouShouldKnow list 10 rules. In short:
- Post MUST begin with YSK and have appropriate flair. Post must be a YSK as defined below.
- In the text body of your post, you must include "Why YSK:" followed by an explanation.
- YSKs regarding Reddit, Facebook, Twitter or any other social media are NOT ALLOWED.
- YSKs with referral links to sites such as Dropbox or Amazon are NOT ALLOWED.
- Ideas or concepts based in conspiracy will be removed at the discretion of the moderators.
- Political posts / Call to arms / support for charities, orgs or political parties not allowed
- No spam or self promotion.
- YSKs regarding computer shortcuts are not allowed.
- Citations are required for YSKs regarding health and science related topics.
- Don't shitpost. Be civil - Remember the human.
How to join
Open reddit.com/r/YouShouldKnow and press “Join”. Read the community rules in the sidebar before you post: every subreddit is run by its own volunteer moderators.
Frequently asked questions
How many subscribers does r/YouShouldKnow have?
r/YouShouldKnow has 5,642,937 subscribers (Nov 2, 2026), which makes it the #152 safe-for-work subreddit in the SubMouse ranking. It added 11,099 members between Sep 19, 2026 and Nov 2, 2026.
When was r/YouShouldKnow created?
r/YouShouldKnow was created on Oct 7, 2009, so it has been around for 17 years.
Is r/YouShouldKnow still active?
Yes. r/YouShouldKnow gets about 4.1 new posts a day (average of the last four weeks). Over its lifetime the archive counts 111,718 posts and 3,276,630 comments.
What is the best time to post in r/YouShouldKnow?
Based on post counts from Oct 29, 2026 to Nov 4, 2026, the busiest day was Tuesday and the quietest Sunday, and most posts arrive around 22:00 UTC, with the fewest around 00:00 UTC. More posts also means more competition, so a quieter hour can help a post get noticed.
What kind of posts are on r/YouShouldKnow?
The community describes itself as: “You Should Know” Recent post titles often mention ysk, google, shopping, sodastream and headquartered. Most posts are text posts (100%).
Is r/YouShouldKnow SFW?
Yes. Reddit does not mark r/YouShouldKnow as an 18+ (NSFW) community. SubMouse lists safe-for-work subreddits only.
What are the rules of r/YouShouldKnow?
Join the community on Reddit first, then use “Create post”. r/YouShouldKnow accepts text posts only, with galleries enabled. It has 10 posted rules, starting with: “Post MUST begin with YSK and have appropriate flair. Post must be a YSK as defined below.”; “In the text body of your post, you must include "Why YSK:" followed by an explanation.”; “YSKs regarding Reddit, Facebook, Twitter or any other social media are NOT ALLOWED.”. Moderators remove posts that break the rules, so read them in the sidebar before posting.
What subreddits are similar to r/YouShouldKnow?
Communities with similar topics include r/nflmemes (1.2M), r/booksuggestions (1.4M), r/mildlyinteresting (25.4M), r/likeus (2.8M) and r/whatisit (2.9M).
Stats from public data (data updated Nov 2, 2026; activity, rules and archive totals via the Arctic Shift archive, Nov 6, 2026). Point and comment counts are archive snapshots and can be lower than on Reddit today. SubMouse is an independent directory and is not affiliated with Reddit or the moderators of r/YouShouldKnow.