One Keyword, Three Platforms: Threads, Instagram & Facebook Replies

What does “one keyword, three platforms” mean?

Brands, shops and creators often post the same campaign to Instagram, a Facebook Page and Threads, and people leave the same kinds of comments everywhere: “+1”, “I want it”, “price?”. One keyword, three platforms means catching all of them with the same keywords, with each platform doing what its official API allows:

• Instagram post and Reel comments: an automatic public reply, then an Instagram DM with the link, coupon or card carousel.
• Facebook Page post comments: an automatic public reply, then the same content by Messenger.
• Threads post replies: an automatic public reply. Threads has DMs, but Meta offers no API for them, so automation replies publicly and tells people which Instagram or Facebook post to comment on, and with what word.

The split is simple: Threads carries the conversation, and Instagram or Facebook DMs deliver the link. The Threads public reply is the bridge.

Why connect Threads with Instagram and Facebook?

Because the audience is there. Semrush data for January 2026 puts more than a fifth of Threads web traffic in Taiwan, DataReportal's late-2025 figures give Threads ads a reach of about 6.65 million people in Taiwan, and WiseApp counted 7.98 million Threads users in South Korea in July 2026 (reported by MTN in September 2026). A campaign's first wave of conversation increasingly happens on Threads.

The catch is that Threads only allows public replies, and links in Instagram post captions can't be clicked (an existing Instagram limitation). Connecting the three platforms covers both gaps: get the conversation going on Threads, use the public reply to send people to Instagram or Facebook, and let the DM there deliver a link button they can tap.

It's also simpler for your audience. One campaign, one keyword: people don't have to learn three different instructions, and every post can carry the same line, such as “Comment +1 for the offer”.

Key facts: Meta's rules and limits (October 2026)

• Threads permissions: approved in Meta App Review on October 17, 2026; Social Automation uses Meta's official APIs.
• Threads is public replies only: Meta offers no Threads DM API.
• Threads reply cap: up to 1,000 API replies per Threads profile in a rolling 24 hours (Meta's limit), each up to 500 characters.
• Instagram and Facebook DMs: these are Private Replies, sent within 7 days of the comment and once per comment.
• Instagram DM content: text with up to 3 link buttons, one image (jpg/png, up to 8MB) or a carousel of up to 10 cards, sent as one message.
• Account requirements: Instagram must be a professional account (business or creator) linked to a Facebook Page; Facebook needs permission to manage the Page; Threads is authorized separately with your Threads account.
• Account slots: an Instagram account, a Facebook Page and a Threads account each use one. The 7-day trial connects 3, Lite 2, Standard 5 and Pro unlimited. Threads is included in every plan with no per-reply charge.

How to set it up in six steps

1. Connect three accounts: on the Connections page, log in with Facebook to authorize Instagram and your Page (tick the Page and Instagram account on the permission screen), then click Connect Threads and authorize your Threads account separately.
2. Pick one set of keywords: for example “+1, want, offer”, with Contains keyword so “+1 me too” counts. All three activities use this set.
3. Create the Instagram activity: choose the “IG post comment” trigger and the post (or Apply to my next post / Reel if it isn't published yet), enter the keywords, write 3–5 public replies such as “Sent you a DM 📩”, and build the DM in the block editor: text with a “Buy now” button, or the coupon code. To grow followers at the same time, turn on Require a follow before sending (Instagram only).
4. Create the Facebook activity: choose “FB post comment”, use the same keywords and copy the DM content; it goes out through Messenger.
5. Create the Threads activity: choose “Threads post reply”, then All posts, a post from the list, or a pasted post link (Threads has no next-post option, so publish first). Use the same keywords and write 3–5 public replies that spell out the next step, for example “The code is on our Instagram launch post: comment +1 there and we'll DM you 🙌”.
6. Publish and test: set all three activities to Active, comment with your keyword on each post from a different account, and check Trigger Logs for the replies and DMs.

Three common setups: product links, limited-time offers, group buys

Product links: a launch post

• Keywords: “link, how to buy, price”, Contains keyword.
• Instagram/Facebook DM: one line of text and a “Buy now” link button; for several products, a card carousel with one card each.
• Threads public reply: “Thanks! The buy link is on our Instagram launch post: comment ‘link’ there and we'll DM it to you”, plus 2–4 variations.

Limited-time offer: a weekend code

• Schedule: run all three activities as Scheduled with the same start and end time, so replies stop when the offer ends.
• Keywords: “offer, code”.
• Instagram/Facebook DM: the code, its expiry and a checkout link button.
• Threads public reply: “The weekend code is on our Instagram and Facebook posts: comment ‘offer’ there for a DM. Ends Sunday night.”

Group buy: an order-taking post

• Keywords: “+1, join”, usually Contains keyword; switch to Exact match if ordinary chat keeps setting it off.
• Instagram/Facebook DM: the order form link, the cut-off date and pickup details. To have buyers follow you too, turn on Require a follow before sending on Instagram.
• Threads public reply: “+1 noted! The order form is on our Instagram post: comment +1 there and we'll DM you.”
• Order matching: paid plans can export the entrant list (CSV), which helps when you close orders.

How should you write the Threads public reply?

• Say where and what: which platform, which post and which keyword, for example “comment +1 on the pinned post at @yourbrand on Instagram”.
• Write 3–5 versions: the system rotates them at random. Meta's spam policy calls out high-frequency, repetitive content, so one sentence repeated hundreds of times is a bad idea.
• Keep it short: the limit is 500 characters, but one or two sentences read best.
• Sound like you: the reply is public, so use the tone you'd use answering comments yourself.

Examples to adapt:

• Thanks for the comment! The code is on our Instagram launch post: comment +1 there and it's yours 🙌
• Got it! The link lives on Instagram: comment +1 on our latest post and we'll send it over
• Thank you! For the offer, comment +1 on our Instagram or Facebook post 📩

What are the limits?

• No automated DMs on Threads: Threads has DMs, but Meta offers no API for them. Any DM has to go through Instagram or Facebook.
• 1,000 replies per 24 hours: Meta's cap for each Threads profile. Paid plans don't limit triggers, but Threads replies still stop at this cap.
• Three activities, three account slots: Lite connects 2 accounts, so all three platforms need Standard or Pro; the 7-day trial connects 3, enough to test the full setup.
• People move across platforms themselves: the system doesn't match a Threads commenter to their Instagram account; they get the DM after commenting on Instagram or Facebook.
• DMs have a time window: Instagram and Facebook Private Replies go out within 7 days of the comment, once per comment, so keep those activities Active.
• One reply per Threads comment: if several activities on the same Threads account match a comment, only one replies — an activity set to that specific post wins, then the most recently created one.

To set up the Threads part on its own, see the Threads auto-reply guide; the full Instagram DM setup is in the Instagram comment-to-DM guide.