Can I post about my product here?
No. The rules do not allow promotional posts, and a post about your own product would fail the source, opinion, and software rules all at once.
Subreddit guides
r/todayilearned rules, stats, and what to post
A source-backed Rankhog guide to r/todayilearned: public rules, community context, posting fit, and startup-promotion risk before you publish.
By Anthony Riera, founder and operator of Rankhog.
Subreddit guides combine public Reddit source URLs, captured rules, visible verification dates, and Rankhog's account-safety workflow.
Current public stats
- Members
- 41,676,329
- Verified
- September 28, 2026
- Category
- General knowledge and trivia readers
Rules can change, so Rankhog keeps verification dates and the original public Reddit sources visible.
Rule summary
- Inaccurate/unverifiable/not supported by source: Please link directly to a reliable source that supports every claim in your post title. Images alone do not count as valid references. Videos are fine so long as they come from reputable sources (e.g. BBC, Discovery, etc).
- No personal opinions/anecdotes/subjective posts: (e.g "TIL xyz is a great movie")
- No recent sources: Any sources (blog, article, press release, video, etc.) more recent than two months are not allowed.
- No politics/agenda pushing: No submissions regarding or related to the following: recent politics, politicians, police misconduct, race/religion/gender, environmental issues, social issues, etc. See wiki for more detailed explanation
- No misleading claims: Posts that omit essential information, or present unrelated facts in a way that suggest a connection will be removed.
- Too general/can't stand on its own/how to: a. Titles must begin with "TIL" or "Today I Learned" b. Make them descriptive, concise and specific (e.g. not "TIL something interesting about bacon"). c. Titles must be able to stand on their own without requiring readers to click on a link. d. "TIL about x." and other broad posts don't belong on TIL. e. "TIL how to ..." posts belong on /r/HowTo. f. "TIL the definition of a word..." Word definitions/translations/origin
- No submissions about software/websites: No submissions related to the usage, existence or features of specific software/websites (e.g. "TIL you can click on widgets in WidgetMaker 1.22").
- All NSFW links must be tagged.: All NSFW links must be tagged.
Works well
- A TIL about a surprising historical fact in your industry, backed by a reputable article older than two months
- A TIL about a piece of research or a dataset finding from a reliable publisher, with the whole finding stated in the title
- A TIL about an obscure origin story or forgotten event, sourced directly to a reputable publication
- A TIL where the title alone tells the reader the full fact and the link is just the proof
Avoid
- Posting a fact with no reliable source linked, because “Inaccurate/unverifiable/not supported by source” gets it removed
- Linking to an article, blog post, or video published in the last two months, which “No recent sources” forbids
- Writing a title that does not start with “TIL” or “Today I Learned”, which breaks “Too general/can't stand on its own/how to”
- Writing a vague title like “TIL something interesting about marketing”, which the same rule calls out directly
- Writing a title that only makes sense after clicking the link, which the title rules say must stand on its own
- Posting “TIL about x” style broad posts, which the title rules say do not belong here
What r/todayilearned Is For
This community is for people sharing one specific interesting fact they just learned, and the description says it plainly, you learn something new every day and you submit interesting and specific facts about it. The format is a fact in the title, backed by a source, so readers get the whole story without even clicking. The people posting here are general readers and curious browsers, not buyers, and the rules are written to keep the feed factual rather than chatty. There is no room for opinions, stories about your day, or anything that smells like a pitch. If your post would work as a line in a trivia book with a citation at the end, it fits.
Rules That Matter Before Posting
The rule that decides everything here is “Inaccurate/unverifiable/not supported by source”, which requires a reliable source linked directly for every claim in your title. “No recent sources” bans anything published in the last two months, so fresh news is out. “No personal opinions/anecdotes/subjective posts” removes anything subjective, like saying something is great. “No misleading claims” removes posts that omit essential information or suggest connections between unrelated facts. “Too general/can't stand on its own/how to” governs titles, which must start with “TIL” or “Today I Learned”, be specific, and stand on their own without a click. “No politics/agenda pushing” bans recent politics and social issues outright. “No submissions about software/websites” bans posts about the usage, existence or features of specific software or websites, which matters a lot if you build software.
What To Post
A good post here is one specific, verifiable fact you genuinely just learned, written as a title that starts with TIL and tells the whole story by itself. The source must be a reliable publisher and it must be older than two months, which means evergreen facts, not news. For a founder, the honest play is to share surprising facts from your industry's history, research, or data that a reputable outlet already published a while ago. You are building credibility as a curious person, not promoting anything. If the fact happens to touch your field, that is fine, as long as the post is about the fact and the source carries the weight.
What To Avoid
Posts get removed for lacking a reliable source, for using sources newer than two months, for opinions and anecdotes, for political or social topics, for misleading claims, and for vague or broad titles. Software and website posts are banned outright, so a TIL about your own product's features is dead on arrival. Titles that cannot stand alone without the link get removed too. NSFW links must be tagged if you ever share one.
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Common questions about r/todayilearned
Can I link to a news article about my company from this week?
No. “No recent sources” bans any source more recent than two months, so fresh news about your launch is out.
Are links allowed at all?
Yes, links are allowed, but they must point directly to a reliable source that supports every claim in your title.
Can I post a TIL about how my SaaS works?
No. “No submissions about software/websites” bans posts about the usage, existence or features of specific software or websites.
Can I share an interesting fact about my industry?
Yes, as long as the source is reputable, older than two months, and your title starts with TIL and stands on its own.