How to Write a Facebook Post (and Why 480 Characters Is Where the Feed Cuts You Off)

The problem: you wrote "We're excited to announce our new product! Check it out!" and got 4 likes

You launched something. You posted a single sentence with a link. Four likes, zero comments, zero shares — all from employees. The post didn't fail because the product is bad; it failed because Facebook's feed truncates at 480 characters, and your hook ("We're excited to announce...") is the most overused opening on the platform — readers skim past it. The feed shows the first ~480 characters before a "See more" click, and less than 20% of scrollers expand. A post that buries the value below character 480 is invisible. The honest move is a generator that puts the hook in the first 480, matches the post type to a proven template, picks a tone whose opener and CTA align, caps hashtags at 3, and produces 3 variants so you can A/B test instead of guessing.

Fastest path

Open the Facebook Post Generator, type the topic, pick post type and tone, click Generate 3 Variants.

Topic:     Launching our new summer collection
Post type: Announcement
Tone:      Friendly
Audience:  loyal customers and fans
Emoji:     On  ·  CTA: On  ·  Hashtags: On

→ Variant 1 (312 chars, 2 hashtags):
  🎉 Big news! Launching our new summer collection today. Hey friends!
  We could not be more excited to share this with loyal customers and
  fans. Drop a comment below!

→ Variant 2 (238 chars, 2 hashtags):
  🎉 Hey friends! Launching our new summer collection today. This is
  something we have been working on for a while, and today it is finally
  here. Tag a friend who needs this!

→ Variant 3 (278 chars, 2 hashtags):
  ✨ Announcement: Launching our new summer collection today. Here is
  what it means for loyal customers and fans, and why we think you will
  love it. Share your thoughts with us!

The tool took the topic, post type, and tone, rotated three openers from the tone bank, matched each to a template from the post-type bank, appended a CTA from the tone bank, and capped hashtags at 3 from a topic-derived pool. The rest of this guide is why 480 is the truncation line, why 1-3 hashtags beat 10, why 8 post types need different templates, and why tone controls the opener and CTA independently.

The substance: one truncation line, eight templates, six tones

The 480-character truncation and the feed hook

Facebook's feed shows the first ~480 characters of a post, then truncates with a "See more" link. The tool's FB_FEED_TRUNCATE = 480 constant drives the live character counter — green under 480, amber between 480 and the max length, red over the max. The amber state is the warning: your post will render in the feed with a "See more" button, and most scrollers won't click it. The hook — the sentence that makes someone stop scrolling — has to land before character 480.

The tool's templates put the hook first. The announcement template starts with ${e(em1, emOn)}Big news! ${capitalize(topic)}. — emoji, "Big news!", topic, period. That's the hook in 40-80 characters depending on topic length. The story template starts with ${e(em1, emOn)}${opener} ${capitalize(topic)}. It started with a simple idea... — the opener ("Hey friends!") plus the topic plus the narrative arc in 120 characters. Every template front-loads the value because the feed front-loads the visibility. A post that starts with "We're excited to announce" wastes 26 characters on a phrase nobody reads.

The eight post types and why each has its own template

The tool ships 8 post types, each with its own template bank: announcement, question, story, promotion, event, milestone, tip, and behind-the-scenes (bts). Each type has three template variants in buildTemplates — the tool rotates through them based on the seed offset, so Regenerate gives you a fresh angle from the same inputs.

The types exist because a Facebook post is not one format. An announcement says "here's what happened." A question says "what do you think?" — and the question template ends with "Share below 👇" or "We will pin our favorite answer," a CTA that drives comments, not link clicks. A story says "here's the journey" — the template builds a three-beat narrative (started with a simple idea, almost gave up, small wins become big wins) that earns reads. A promotion says "buy this now" — the template includes "Limited quantities" or "Offer ends soon" because urgency drives promotion clicks. An event says "save the date" — the template includes "RSVP now via the link in comments" because events live or die on RSVPs. A milestone says "thank you" — the template credits the audience explicitly because milestones are community moments. A tip says "try this" — the template ends with "Save this post so you do not forget" because saves are a reach signal. A bts says "here's the messy real version" — the template includes "It is not always glamorous, but it matters to us" because authenticity is the bts selling point.

Use the wrong type and the template fights you. A promotion template on a milestone post reads as a sales pitch. A question template on an announcement post buries the news under "what do you think?" Pick the type that matches the goal, not the type that sounds impressive.

The six tones and the independent opener/CTA banks

The tool ships 6 tones: friendly, professional, casual, urgent, inspirational, humorous. Each tone has two independent banks: TONE_OPENERS (4 opening lines) and TONE_CTAS (4 closing CTAs). The template engine picks pick(TONE_OPENERS[tone], seed) for the opener and pick(TONE_CTAS[tone], seed + 1) for the CTA — the seed + 1 offset means the opener and CTA rotate independently, so you don't get the same "rank" of opener and CTA on every variant.

The tone controls the voice, not the structure. A friendly announcement starts with "Hey friends!" and ends with "Drop a comment below!" A professional announcement starts with "We are pleased to share that" and ends with "Learn more via the link in comments." Same template skeleton, different voice. The mistake is picking a tone that doesn't match the post type — an urgent tone on a milestone post ("Do not miss this milestone!") reads as desperate; a humorous tone on a promotion ("Plot twist: this sale is actually good") can undercut the urgency. Match the tone to the post type's intent.

The 3-variant rule and A/B testing

The tool generates 3 variants per run, each rotating a different opener, emoji, and CTA from the same tone banks. The variants are not three different posts — they're three angles on the same post. Variant 1 leads with the topic; Variant 2 leads with the opener; Variant 3 leads with "Announcement:" or "True story:" as a format label. Post all three on different days at different times, track which gets the most reach, and iterate from there. One post is a coin flip; three posts give you signal.

The Regenerate button increments seedOffset and rebuilds the variants with a new seed, rotating to the next opener/CTA/emoji in each bank. This is not AI generation — it's deterministic rotation through a fixed bank. The value is speed: you get three publish-ready variants in one click instead of writing three from scratch.

The hashtag cap and why 1-3 beats 10

The tool's buildHashtags function generates 5-10 topic-relevant suggestions, but the buildVariants function inserts only hashtags.slice(0, 3) into the post. The cap is deliberate. Facebook supports hashtags, but the platform's own research and multiple third-party studies show that posts with 1-3 hashtags get more engagement than posts with 10+. More hashtags read as spam, and Facebook's algorithm has historically penalized spammy hashtag stuffing with reduced reach.

The 5-10 suggestions are there for you to pick from — the tool inserts the first 3 (the most topic-relevant), but you can swap in any of the others by hand. The suggestions come from three sources: the topic words (longest word joined, individual words ≥3 chars), the post-type seed bank (e.g., announcement → #news #update #announcement #bignews #exciting), and the audience (slugified). The slug function strips non-alphanumeric and joins — "summer collection" becomes #summercollection.

Gotchas

480 characters is the feed truncation line. The tool's counter turns amber at 481. Your hook must land before 480 or most scrollers never see it. The templates front-load the value; don't move the hook to the second paragraph.
1-3 hashtags, not 10. The tool inserts 3 and suggests up to 10. More than 3 reads as spam and can reduce reach. Pick the 3 most targeted, not the 3 most generic.
Post type drives the template. A promotion template on a milestone post reads as a sales pitch. Pick the type that matches the goal — announcement for news, question for engagement, promotion for sales, event for RSVPs.
Tone drives opener and CTA independently. The opener and CTA rotate from separate banks (seed + 1 offset). A friendly tone gives "Hey friends!" + "Drop a comment below!" — both friendly. Don't expect a friendly opener with an urgent CTA; pick the tone that matches the whole post.
The variants are templates, not AI. The tool rotates through fixed opener/CTA/emoji banks deterministically. The output is only as good as the topic input. "Launching our new summer collection" produces a targeted post; "stuff" produces a generic one.
The audience field is optional but worth it. Empty audience → the template says "with you." Filled audience → "with loyal customers and fans." The audience makes the post feel addressed to someone, not broadcast to everyone.
The max length is a ceiling, not a target. Default is 500. Facebook supports up to 5,000 characters, but longer posts don't rank better — the first 480 and the CTA are what matter. The tool's fitToLimit function hard-cuts with an ellipsis if you exceed the max; don't rely on the cut, write to the limit.
The Facebook preview is a mock, not a real post. The tool renders a FB-styled card with avatar, page name, engagement bar, and Like/Comment/Share buttons. It's a visual preview, not a scheduled post. Copy the text and paste it into Facebook's composer to publish.
Emoji placement is prepended, not inline. The tool's e() helper prepends the emoji before the first word. If you want emoji inline ("Big news 🎉"), edit the output by hand — the tool doesn't support inline placement.
The "Save this post" CTA on tips drives saves, not clicks. Saves are a reach signal in Facebook's algorithm — a post with many saves gets shown to more people. Use the tip type for educational content where the save CTA makes sense.

Summary

480 characters is the feed truncation line. Facebook shows the first ~480 chars, then "See more." The tool's counter goes green → amber → red at 480. Your hook must land before 480. Every template front-loads the value — emoji, topic, period, in 40-80 chars.
Eight post types, each with its own template bank. Announcement (news), question (engagement), story (journey), promotion (sale), event (RSVP), milestone (thank you), tip (educational), bts (authenticity). Pick the type that matches the goal, not the type that sounds impressive.
Six tones control opener and CTA independently. Friendly, professional, casual, urgent, inspirational, humorous. The opener comes from TONE_OPENERS[tone], the CTA from TONE_CTAS[tone] with a seed + 1 offset so they rotate independently. Match the tone to the post type's intent.
3 variants per run for A/B testing. Each variant rotates a different opener, emoji, and CTA. Post all three on different days, track reach, iterate. Regenerate increments the seed to rotate to the next opener/CTA/emoji in each bank. The variants are deterministic template rotations, not AI.
1-3 hashtags beat 10. The tool inserts 3 and suggests up to 10 from topic words, post-type seeds, and audience. More than 3 reads as spam and can reduce reach. Pick the 3 most targeted.
The audience field makes the post feel addressed. Empty → "with you." Filled → "with loyal customers and fans." The audience turns a broadcast into a direct message.
Generate at the Facebook Post Generator; for Instagram captions use Instagram Caption Generator, for discoverability use Hashtag Generator, and for long-form content use Twitter/X Thread Maker.

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