# What does ICYMI mean?

Canonical: https://postmesh.app/glossary/icymi

By PostMesh team. Published 2026-10-31; updated 2026-10-31.

ICYMI stands for In case you missed it. ICYMI stands for in case you missed it. It's used to point people to something that was already published or posted, like an earlier post, article, video or announcement, so anyone who didn't see it the first time can catch up.

## What ICYMI means

ICYMI is short for in case you missed it. Merriam-Webster defines it that way and adds that it's used especially to draw attention to something previously published or posted online. That second part is the key. ICYMI almost always comes with a pointer: a link, a repost, a screenshot or a summary of something that already happened.

It's a polite way to repeat yourself. Feeds move fast, and nobody sees everything the accounts they follow post. ICYMI admits that openly. It says: this was worth seeing, and you may not have. There's no assumption that the reader was careless, which is why it works so well for resharing.

The tone is friendly and informational. Unlike most internet abbreviations, ICYMI is as common from brands, newsrooms and organizations as from individuals. It's shorthand with a job to do.

## Where ICYMI comes from

The Oxford English Dictionary's earliest evidence for ICYMI is from 2000. The OED added the term in 2016, listing it as an adverb, the same way it treats IMO and FWIW.

Twitter is where it became a fixture. In a Words We're Watching note, Merriam-Webster described ICYMI as a popular hashtag on Twitter, where its brevity suited the 140-character limit of the time. The same note said it had spread to every kind of social media and was showing up more and more in the headlines and copy of traditional media. Merriam-Webster added ICYMI to its dictionary in September 2022, in the same update as [FWIW](/glossary/fwiw).

- 2000: Earliest evidence of ICYMI in the Oxford English Dictionary
- Twitter era: Becomes a popular hashtag, helped by the 140-character limit (Merriam-Webster)
- 2016: The OED publishes its entry for ICYMI
- Sept 2022: Merriam-Webster adds ICYMI to its dictionary, alongside FWIW

*Dates from the Oxford English Dictionary and Merriam-Webster.*

One small point from that Merriam-Webster note: nobody seems to pronounce ICYMI as a word. That makes it an initialism, said letter by letter, rather than an acronym like scuba. Out loud, the full phrase is usually the easier choice.

## How people use ICYMI on social media

ICYMI shows up on every network, usually at the very start of a post so the reader knows right away that it's a recap.

- On X and Threads, ICYMI often opens a repost or a quote post of something from earlier in the week. As a [hashtag](/glossary/hashtag), #ICYMI is still common.
- On Instagram, accounts use it in Stories to point back to a recent post or Reel, and in captions for roundup carousels.
- On LinkedIn, it's used to reshare an article, a launch or a job opening that got buried in the feed.
- On Facebook Pages and in groups, organizers use it to resurface event details or important updates.
- In group chats, it's a quick way to forward news someone wasn't around for.

Some example messages, written for this page:

- ICYMI: our spring menu is live. Link in bio.
- ICYMI, the venue changed to the back room on 5th Street
- In case you missed Tuesday's live stream, here's the full replay. #ICYMI
- ICYMI we published the results of the reader survey. Thread below.
- icymi the group dinner moved to 7:30
- ICYMI: three things that changed in this week's update

Notice the colon after ICYMI in several examples. It's optional, but it signals that what follows is the thing you might have missed, which makes the post easier to scan.

## How brands and newsletters use ICYMI

ICYMI is a staple of brand accounts and email newsletters because it solves a real problem: not everyone who follows you sees every post. Resharing your best work is normal and useful, and ICYMI is an honest label for it.

- Weekly or monthly roundups. A newsletter section or a carousel titled ICYMI collects the posts people engaged with most.
- Email subject lines. "ICYMI: the replay is up" tells subscribers exactly what's inside.
- Reshares of [evergreen content](/glossary/evergreen-content). Guides and tutorials that stay useful can be resurfaced a few weeks later with an ICYMI hook.
- Last calls. A reminder that a sale, an application window or an event signup closes soon.
- Follow-ups after a launch. People who missed launch day get a second chance to see the announcement.

**A good ICYMI post**
- [ ] Points to one specific thing, not a vague recap
- [ ] Says in the first line what was missed
- [ ] Includes the link, repost or key detail right there
- [ ] Adds something new, like a result or a fresh angle
- [ ] Is spaced out from the original post by days, not minutes

Planning these reshares ahead is easier than remembering them. Many teams keep ICYMI slots on their [content calendar](/glossary/content-calendar), a few days after each big post. If you schedule with PostMesh, you can queue the follow-up when you publish the original, up to 30 days ahead. For how often reposting the same idea across networks is fine, see [Does cross-posting hurt engagement?](/blog/does-cross-posting-hurt-engagement).

## Writing an ICYMI post people actually read

The weakest ICYMI posts just repost the original with four letters on top. The ones that get a second wave of attention give people a new reason to look. A simple order that works on most networks:

1. Lead with ICYMI and the topic in the same line, so the post makes sense even if someone reads nothing else.
2. Add what's new since the first post: how many people signed up, a common question you can now answer, or a detail you left out.
3. Put the link, repost or key information right there. Don't make people hunt for the thing they missed.
4. Rewrite the [caption](/glossary/caption) rather than pasting the old one. Followers who did see the original will skip a word-for-word copy.
5. Pick a different time of day than the first post, so it reaches people who weren't online then.

That last point is the whole idea of ICYMI. The people who missed your post the first time often missed it because of when it went out. A follow-up at a different hour, or on a different day of the week, is how you reach them. Network-specific timing guides, like [the best time to post on Instagram](/blog/best-time-to-post-on-instagram), are a good starting point.

## How to reply to ICYMI

ICYMI posts rarely need a reply, but when they get one, it's usually one of these.

**Did you actually miss it?**
- Yes, and it's useful → Say thanks or engage with it: "Thanks, I completely missed this" and a like or share.
- No, you saw it → No reply needed. A like is enough if you want to support it.
- A friend sent it in a chat → Acknowledge it: "oh wow, didn't know" or ask a follow-up question.
- You've seen it many times → Ignore it or mute. Repeated ICYMIs are a sign the account reposts a lot.

*ICYMI is information, not a question. Responding is optional.*

## When not to use ICYMI

ICYMI is one of the most workplace-friendly abbreviations, but it can backfire.

- When it implies the reader should have known. "ICYMI, I already answered this in my last email" sounds passive-aggressive. If you're repeating information because someone missed it, just repeat it kindly.
- When nothing was posted before. ICYMI only makes sense for something that already went out. Using it on a brand-new post confuses people.
- When you overuse it. An account that labels half its posts ICYMI is mostly reposting, and followers notice.
- In formal documents. Reports, contracts and official notices should say "as a reminder" or "as previously announced".
- For audiences unfamiliar with internet shorthand. In a newsletter for a general audience, spelling out "in case you missed it" costs little.

> The passive-aggressive ICYMI is common enough at work that some readers hear it as a jab even when you don't mean one. When replying to a person rather than an audience, consider writing "just resending this in case it got buried".

## ICYMI vs IYKYK, BTW and TL;DR

These abbreviations all manage what a reader knows, in different directions.

| Term | Stands for | What it does |
| --- | --- | --- |
| ICYMI | In case you missed it | Points to something posted earlier |
| IYKYK | If you know, you know | Withholds the explanation on purpose |
| BTW | By the way | Adds a side note to the current conversation |
| TL;DR | Too long; didn't read | Gives the short version of a long text |

**ICYMI**
- Looks back
- Resurfaces something old
- Great for recaps and reshares

**IYKYK**
- Leaves people out on purpose
- Rewards insiders
- Best for jokes and memories

**TL;DR**
- Summarizes
- Saves the reader time
- Best at the top or bottom of long posts

*ICYMI brings people up to speed. IYKYK does the opposite.*

[IYKYK](/glossary/iykyk) is the odd one out: it hides context instead of sharing it. [TL;DR](/glossary/tldr) pairs well with ICYMI in a long roundup, giving people the short version before the links. And if your ICYMI post needs to fit on X, the [X character counter](/tools/twitter-character-counter) shows how much room the link and text leave you.

## Questions

### Is ICYMI rude?

No. It's one of the most neutral abbreviations. It only sounds rude when it's used to imply someone should already have known something.

### Can brands use ICYMI?

Yes. It's common in brand posts, email subject lines and newsletter roundups because it honestly labels a reshare of something posted earlier.

### How do you pronounce ICYMI?

Most people say the letters, I-C-Y-M-I, or just say the full phrase. Merriam-Webster notes it isn't pronounced as a word.

### Do you put a colon after ICYMI?

It's optional. A colon or comma after ICYMI makes it clear that what follows is the thing you might have missed.

### Is ICYMI OK in a work email?

In internal updates and newsletters, yes. When replying to one person, "resending in case this got buried" sounds friendlier.

### When did ICYMI start?

The Oxford English Dictionary's earliest evidence is from 2000. It became popular as a Twitter hashtag before spreading to other networks and the news.

## Related terms

- [IYKYK](https://postmesh.app/glossary/iykyk)

- [TL;DR](https://postmesh.app/glossary/tldr)

- [FWIW](https://postmesh.app/glossary/fwiw)

- [Evergreen content](https://postmesh.app/glossary/evergreen-content)

- [Content calendar](https://postmesh.app/glossary/content-calendar)

- [Hashtag](https://postmesh.app/glossary/hashtag)

## Sources

- [Merriam-Webster: ICYMI](https://www.merriam-webster.com/dictionary/ICYMI)

- [Merriam-Webster: What Does ICYMI Mean? (Words We're Watching)](https://www.merriam-webster.com/wordplay/what-is-icymi)

- [Merriam-Webster: We Added 370 New Words to the Dictionary for September 2022](https://www.merriam-webster.com/wordplay/new-words-in-the-dictionary-september-2022)

- [Oxford English Dictionary: ICYMI, adv. (factsheet)](https://www.oed.com/dictionary/icymi_adv?tab=factsheet)

- [Merriam-Webster: 93 Common Texting Abbreviations](https://www.merriam-webster.com/wordplay/93-common-texting-abbreviations)