Can I post a link to my own blog or company website?
Yes, links are allowed, but the rule named "Inaccurate/unverifiable/not supported by source" requires you to link directly to a reliable source that supports every claim in your title.
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
- 41,644,126
- Verified
- September 16, 2026
- Category
- Science and research communities
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
- TIL that a specific historical event happened on this date, linked to a reputable archive article older than two months.
- TIL that a scientific study found a specific result, linked to the original study page on a university or journal website.
- TIL that a well known company was founded under an unusual condition, linked to a reputable biography or news source older than two months.
- TIL that a common household item was originally invented for a different purpose, linked to a reliable reference source.
Avoid
- Do not link to a source published within the last two months because the rule named "No recent sources" blocks any source more recent than that.
- Do not post about software or websites because the rule named "No submissions about software/websites" removes posts about usage, existence, or features of specific software and websites.
- Do not push politics or social agendas because the rule named "No politics/agenda pushing" bars recent politics, politicians, police misconduct, race, religion, gender, environmental issues, and social issues.
- Do not write vague titles like TIL about a topic because the rule named "Too general/can't stand on its own/how to" rejects broad posts and titles that cannot stand alone.
- Do not use images as your source because the rule named "Inaccurate/unverifiable/not supported by source" says images alone do not count as valid references.
- Do not share personal opinions or anecdotes because the rule named "No personal opinions/anecdotes/subjective posts" removes subjective posts.
What r/todayilearned Is For
This community is for sharing interesting and specific facts you just learned. The description says you learn something new every day, and the room wants you to submit facts backed by a reliable source. It is not a place for opinions, how to guides, or software announcements.
Rules That Matter Before Posting
The rule named "Inaccurate/unverifiable/not supported by source" is the first gate, because it demands a reliable source for every claim in your title and rejects images as valid references. The rule named "No recent sources" blocks anything published within the last two months, which kills time sensitive marketing angles. The rule named "No politics/agenda pushing" removes posts about recent politics, politicians, police misconduct, race, religion, gender, environmental issues, and social issues. The rule named "No submissions about software/websites" directly blocks posts about the usage, existence, or features of specific software and websites, which is the rule most likely to catch a founder. The rule named "Too general/can't stand on its own/how to" requires titles to begin with TIL or Today I Learned, be descriptive and specific, and stand alone without a click. The rule named "No misleading claims" removes posts that omit essential information or present unrelated facts to suggest a connection. The rule named "No personal opinions/anecdotes/subjective posts" removes anything subjective. The rule named "All NSFW links must be tagged." requires tagging on any not safe for work link.
What To Post
A good post here is a genuinely interesting, specific fact tied to a reliable source older than two months. Your title must start with TIL or Today I Learned and state the fact clearly enough that a reader learns it without clicking. If you are a founder, the only respectful move is to find a true, verifiable fact connected to your industry or domain, link to a reputable publisher, and let the fact stand on its own. This is not a place to pitch your product, but a place to show curiosity and credibility through a well sourced piece of knowledge.
What To Avoid
Avoid anything recent, because the rule named "No recent sources" blocks sources more recent than two months. Avoid politics and agenda pushing, because the rule named "No politics/agenda pushing" removes posts about recent politics, politicians, police misconduct, race, religion, gender, environmental issues, and social issues. Avoid software and website posts, because the rule named "No submissions about software/websites" blocks posts about usage, existence, or features of specific software and websites. Avoid vague titles, because the rule named "Too general/can't stand on its own/how to" rejects titles that cannot stand alone or lack specificity. Avoid images as sources, because the rule named "Inaccurate/unverifiable/not supported by source" says images alone do not count. Avoid misleading claims, because the rule named "No misleading claims" removes posts that omit essential information or force a connection between unrelated facts. Avoid subjective posts, because the rule named "No personal opinions/anecdotes/subjective posts" blocks opinions and anecdotes. Avoid untagged NSFW links, because the rule named "All NSFW links must be tagged." requires tagging.
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Common questions about r/todayilearned
Can I post about my software product or website?
No, the rule named "No submissions about software/websites" blocks posts about the usage, existence, or features of specific software and websites.
Can I use a news article from last week as my source?
No, the rule named "No recent sources" blocks any source more recent than two months.
What format should my title follow?
Your title must start with TIL or Today I Learned, be descriptive and specific, and be able to stand on its own without requiring readers to click the link, according to the rule named "Too general/can't stand on its own/how to".