How to write viral posts: the breakdown outperforms the work.

The post about the work often outperforms the work. When PJ Accetturo’s AI-generated Kalshi ad went viral, the thread breaking down his prompts pulled bigger numbers than the ad itself. For creative professionals that inverts the usual math: the film, the identity system, the score takes weeks; the breakdown takes an evening, and the breakdown is what the feed rewards. This tutorial covers the mechanics: what makes people share, how X, LinkedIn, and Instagram each rank a post, and how to turn your process into the format each platform pays.

Posts are distribution without production cost

A text post is the cheapest distribution a creative has: no shoot, no edit, no render queue, and the same feed placement as content that cost a production week. A thread or a carousel costs an evening of writing. For anyone already making work, that arithmetic makes the post the highest-leverage hour in the week: the work supplies the material, the post supplies the audience.

This page is the text half of a pair. Short-form video plays a different game with different mechanics, covered in the video tutorial. The rest of the Library is about making the work. This page is about making the work travel.

What makes a social post spread?

People share what makes them look good for sharing it and feel something while reading it. Jonah Berger’s research at Wharton, collected in Contagious, reduces spreading to six drivers, the STEPPS framework: social currency, triggers, emotion, public visibility, practical value, and stories. A post spreads when passing it on raises the sender’s status or arms them with something useful.

The emotion finding is the one most creators miss. High-arousal emotions drive sharing: awe, anger, amusement, anxiety. Low-arousal emotions suppress it: sadness, quiet contentment. A breakdown that makes a reader say “I had no idea it worked like that” is awe with a practical payload, which is why the genre travels so well.

Notice how a good process post stacks the drivers. Usable prompts are practical value. Insider knowledge is social currency for whoever reposts it. The gap between the finished frame and the messy process is awe. One post, four drivers, before the platform math even starts.

How do you write a viral X thread?

Open with a first post that works as a complete hook: a claim, a reason to believe you, and a promise of what the thread delivers. Then one idea per post, whitespace between lines, an image every three or four posts, and a final post that recaps and asks for the follow. The first post does almost all the work; everything after it converts the click into a read.

The ranking math is documented. When X open-sourced its recommendation code in 2023, the weights became public: against a like at 0.5, a repost scored 1.0 and a reply 13.5, so a reply counts roughly 27 times a like, a repost about twice, and a reply the author engages with scored 75, far above everything else. Profile clicks and dwell score positive; blocks and mutes weigh heavily negative, so bait that annoys costs more than it earns. Bookmarks are a strong signal, and resource compilations are built to be bookmarked. External links in the post body still suppress reach in practice; put the link in a reply.

Sahil Bloom built roughly a million followers between 2020 and 2023 on curiosity-driven educational threads. George Mack’s “High Agency” essay, months in the writing, remains the model: one definitive idea, exhaustively illustrated. Neither depends on news. Both depend on a hook that promises a payoff and a body that overdelivers on it.

What performs best on LinkedIn?

Document posts, the PDF carousels LinkedIn renders inline, are the top format, and dwell time is the metric that decides everything else. Richard van der Blom’s Algorithm Insights 2025, the largest ongoing third-party study of the platform, measures document posts at roughly 6.6 percent engagement against under 2 percent for text posts, and finds posts holding attention 61 seconds or longer reach about 15.6 percent engagement versus 1.2 percent for posts abandoned inside three seconds.

The same study puts overall views down about half year over year, so the bar for a post that travels has risen. Two levers remain under your control. The first 60 to 90 minutes of comments set a post’s trajectory, so publish when your audience is online and answer immediately. And author replies of 15 or more words extend reach, so treat the comment thread as part of the post, not the afterparty.

Two working models. Justin Welsh built over 600,000 followers and a solo business past ten million dollars on daily single-idea posts: a hook line, a line-broken story, one takeaway. Jay Clouse turns his Creator Science interviews into LinkedIn breakdowns, the research-artifact-as-post pattern: the interview is the work, the breakdown is the distribution.

Do Instagram carousels still beat Reels?

On engagement and saves, yes; on raw reach, no. Socialinsider’s 2025 benchmarks put carousels at 1.92 percent average engagement against 1.74 percent for Reels and 1.22 percent for single images, and carousels collect about twice the saves of Reels per impression. Reels still find more strangers, which is why the pairing works: the Reel finds the audience, the carousel converts it.

Carousels also get a second serve. A viewer who scrolls past without swiping can be re-served the same post opening on slide 2, a second chance at the same viewer that no other format gets. And sends per reach is an explicit ranking input; Adam Mosseri said so directly in January 2025. Design the last slide for the send, not the like.

Carousel grammar: slide 1 is a full title-card hook, one idea per slide, a cliffhanger at each slide edge so the swipe continues, and a save-or-share ask on the last slide. For a designer or filmmaker this is home turf. A carousel is editorial design at feed scale: ten covers in a row, each one earning the next swipe.

The process breakdown is the genre you own

For creatives working with AI, the making-of is a top-performing genre in its own right: the prompts, the shot count, the keep rate, the cost, and what failed. PJ Accetturo’s prompt breakdown of his Kalshi ad, shot with Veo 3, outperformed the ad it explained. Audiences reward the door into the workshop more reliably than the shop window.

The rule for members is simple: ship the film, then ship the thread the same week, while the numbers are fresh and the topic is warm. The short-film pipeline post shows the figures worth logging as you go: takes generated, takes kept, cost per finished second. Those production notes are the raw material of the breakdown, and nobody else has them.

Name the stack and the bill. Readers act on breakdowns that say which model, which platform, and what it cost; our GenAI platform comparison is the pricing reference to link when they ask. And the same breakdown cut as vertical video is its own craft, covered in the short-form video tutorial.

Mechanics that survive every platform

Six rules hold on every feed, whatever the ranking weights do this quarter: write the hook before the piece, keep one idea per unit, front-load the payoff, use concrete numbers instead of adjectives, treat formatting as pacing, and end with a reason to save or send. Platforms reweight constantly; these do not move.

• Write the hook first. If the first line cannot carry the piece, the piece never gets read. Draft ten hooks, keep one, then write to it.
• One idea per unit. Post, slide, or line: each unit makes one point. Two ideas in one unit halves both.
• Front-load the payoff. Deliver the most useful thing early. Feeds punish throat-clearing with abandonment, and abandonment is measured.
• Concrete numbers beat adjectives. “41 takes, 6 kept, $180” outperforms “a lot of iteration.” Specificity is credibility.
• Formatting is pacing. Line breaks and whitespace are the edit rhythm of prose. A wall of text is an unwatchable rough cut.
• End with a reason to save or send. Saves, bookmarks, and sends are the heaviest signals on every platform. Earn them explicitly.

Should you use AI to write your posts?

Use a model for hook variants and tightening, never for the whole post. Feeds now measurably suppress generic AI prose: van der Blom’s 2025 LinkedIn data shows AI-written posts earning near-zero dwell and saves, and every platform above ranks on exactly the signals generic text cannot earn. Your specifics are the moat: your numbers, your failures, your screenshots. A model has none of them.

The workflow that holds up: draft the post yourself from your production notes, ask a model for ten hook variants and keep the sharpest, then ask it to cut 20 percent. The facts stay yours; the model does the sanding. The moment it supplies the substance, the post joins the undifferentiated middle of the feed, and the middle of the feed is where reach goes to die.

Resources

• Jonah Berger, Contagious. The share-psychology foundation; the Wharton interview is the free summary.
• Richard van der Blom, LinkedIn Algorithm Report. The annual study behind the LinkedIn numbers above; free PDF, summarized here.
• Justin Welsh. The single-idea LinkedIn post, systematized into a business.
• Creator Science. Jay Clouse’s newsletter; evidence-first creator strategy and the interview-to-breakdown pattern.
• Socialinsider benchmarks. The format-by-format Instagram engagement data.
• Hootsuite’s carousel guide. The practical walkthrough of carousel construction.

Questions creatives ask

What makes a social post spread? High-arousal emotion plus practical value. Berger’s STEPPS framework names six drivers: social currency, triggers, emotion, public visibility, practical value, stories. Awe, anger, amusement, and anxiety drive sharing; sadness and contentment suppress it. A process breakdown is awe with a practical payload.

How do you write a viral X thread? A first post that is a complete hook: claim, credibility, promise. One idea per post, whitespace, an image every three or four posts, a recap with a follow ask at the end. Replies weigh roughly 27 times a like, author-engaged replies far more, bookmarks are a strong signal, and links belong in a reply, not the body.

What performs best on LinkedIn? Document posts, at roughly 6.6 percent engagement versus under 2 percent for text. Dwell decides: 61+ seconds of attention reaches about 15.6 percent engagement, under three seconds gets 1.2 percent. Publish when your audience is on, then work the comments for the first 90 minutes with replies of 15 or more words.

Do Instagram carousels still beat Reels? On engagement (1.92 versus 1.74 percent) and saves (about double per impression), yes. Reels win raw reach, so pair them: the Reel finds the audience, the carousel converts it. Sends per reach is an explicit ranking input, so build the last slide for the send.

Should you use AI to write your posts? For hook variants and tightening only. Generic AI prose measurably dies in every feed. The post’s substance has to come from your production notes, because your numbers, failures, and screenshots are the one input no other account can generate.