Comment Keyword Triggers: How to Automatically Reply When Someone Comments on Your Facebook or Instagram Ads

If you've run a Facebook or Instagram ad, you've seen it. Someone comments "link?" on your best ad. Or "price?" Or "how do I get this?" They're a hot lead — they've seen your ad, they want to take action, and they've raised their hand in public.

What happens next usually isn't great. The comment sits there for hours, sometimes days. By the time someone replies, the prospect has moved on.

Comment keyword triggers solve this. When someone comments a word you've defined — "link", "price", "buy", "interested", "send me the code" — an automated reply fires instantly. Every time. At 2am on a Saturday. While your team is in a meeting.

This guide explains how keyword triggers work, how to set them up, and how to write responses that convert.

What is a comment keyword trigger?

A comment keyword trigger is an automation rule that monitors incoming comments on your Facebook Pages, Instagram accounts, and ad posts. When a comment contains a word or phrase from your defined list, the automation fires — posting a reply comment immediately.

The trigger is keyword-based, meaning it activates on pattern-match: if the comment contains any word from your list, the reply goes out. It doesn't matter how the comment is phrased. "What's the price?" and "how much does it cost??" and "price pls!" all match the keyword "price" and fire the same automation.

Why this matters for ad performance

Speed. The first reply to a buying-intent comment wins. A prospect who comments "interested" and gets a reply in 10 seconds converts at a dramatically higher rate than one who gets a reply in 4 hours. Keyword triggers respond in seconds, consistently. Scale. A brand running 20 active ad sets can't manually monitor comment threads in real time. Keyword triggers watch every single post simultaneously — something no human team can do. Social proof. A comment thread where questions get fast, helpful replies looks healthy. An ad with unanswered comments looks like the brand has abandoned it. Automated replies keep threads looking active and managed. Capture the intent moment. When someone comments "link?" on your ad, they're ready. That's the highest-intent action short of clicking the buy button. An instant reply with the link captures that moment. A reply 6 hours later probably misses it.

How to set up keyword triggers in MyComments.io

Step 1: Connect your pages

In MyComments.io, go to Connected Accounts and connect your Facebook Pages and Instagram Business accounts. The connection uses the official Meta Graph API — takes under 2 minutes.

Step 2: Create a new automation

Go to Lead Automations in the sidebar and click New Automation.

Step 3: Name your automation

Give it a descriptive name that tells you what it does. "Price reply", "Link reply", "Discount code reply". You'll likely create several of these over time and you want them easy to identify at a glance.

Step 4: Choose which pages it applies to

You can apply the automation to all connected pages or specific ones. If you're testing a new offer, you might want to run it only on the campaign for that product first.

Step 5: Set the trigger type to Keywords

In the Trigger Condition section, select Keywords instead of Sentiment.

Enter your trigger keywords separated by commas. The automation fires if any of these words appear in a comment:

link, url, where to buy, how to order, send me

price, cost, how much, pricing, what does it cost

discount, promo, code, coupon, sale, offer

interested, want this, buy, purchase, order

Think about every variation of how a real customer might ask for the same thing. Include common misspellings if relevant to your audience.

Step 6: Write your reply

This is what gets posted as a reply to the commenter's comment. A few principles:

Use {name} to personalise. If you write "Hi {name}, here's the link:", it becomes "Hi Sarah, here's the link:" in the actual reply. Personalisation increases response rates significantly. Be direct. The person asked a specific question. Answer it immediately — don't make them click through three sentences to find the link. Include a call to action. Don't just drop the link. "Check it out here and let me know if you have questions" keeps the conversation open. Example — link request:

Hi {name}! Here's the direct link: [your URL] 🛍️ Let me know if you have any questions!

Example — price question:

Hi {name}! Pricing starts at $X — you can see all options and grab your free trial here: [URL] Happy to answer any questions!

Example — discount inquiry:

Hey {name}! Use code WELCOME15 at checkout for 15% off your first order 🎉 [URL]

Step 7: Save and activate

Click Create Automation. The rule is now live and monitoring all your connected pages and ad posts in real time.

Keyword trigger best practices

One automation per intent type. Don't bundle "price" and "link" into the same automation with the same reply — someone asking for a link wants the link, not a pricing table. Create separate automations for different intents with responses that match. Keep the list tight. Adding 50 keywords increases the chance of false positives — triggering on comments that mention price in a complaint, for example. Start with 3–5 high-confidence keywords per automation and expand if needed. Watch for false positives in the first week. Check which comments triggered each automation. If "link" is firing on "your product is the missing link I needed ❤️", you may want to refine your keywords. Combine keyword triggers with comment moderation. If you're using keyword triggers to reply to buying-intent comments, run comment moderation simultaneously to hide spam, competitor links, and negativity from the same threads. The combination — clean comment section + instant replies to interested prospects — is what actually moves ROAS. Update triggers when you run new campaigns. If you're running a specific offer ("type SALE for our discount"), create a trigger for that campaign. Delete or disable it when the offer ends.

Keyword triggers vs sentiment triggers: which to use

MyComments.io offers two trigger types in Lead Automations:

Keyword triggers fire when specific words appear in a comment. They're deterministic — you know exactly which comments will activate them. Best for: link requests, price questions, discount requests, buying intent signals. Sentiment triggers fire when the AI detects a certain emotional tone — positive, neutral, or "needs reply". They're broader — they catch comments that indicate interest or need without using specific trigger words. Best for: general engagement, positive reactions from prospects, comments that need a reply but don't fit a keyword pattern.

For high-intent ad comments, keyword triggers tend to perform better because they're precise. A comment of "yes! send me the link!" doesn't need AI sentiment analysis — it needs the link, and it needs it now.

What to combine this with

Keyword triggers on their own are a significant improvement over manual monitoring. But the brands getting the most from comment automation typically run three things simultaneously:

Comment moderation — Hide spam, competitor mentions, profanity, and hate speech automatically so your comment sections stay clean. Keyword triggers and moderation run independently and don't interfere. AI Agent auto-replies — Train the AI on your business context so it answers general customer questions (shipping, returns, sizing) without you writing specific keywords for every possible question. Keyword triggers handle the high-intent commercial moments; the AI handles everything else. The combination means your ad comment section is clean, questions get answered instantly, and buying intent gets captured in real time — without anyone on your team having to monitor it. Set up your first keyword trigger free →