The short answer
Ask for a specific keyword in the caption, answer every matching comment with an instant private DM, and make that first DM end with one question that moves toward the order. Continue the chat with a person or an AI agent, collect the buyer's details, and follow up once within 24 hours. Comment-to-DM tools on Meta's official API, such as Chatmizer or ManyChat, automate the private reply.
Key takeaways
- A clear keyword in the caption beats "DM us for details".
- The private reply must arrive in seconds, while the person is still scrolling.
- The first DM sells the next step, not the whole product.
- Every commenter becomes a tagged contact you can follow up.
Why do "price?" comments not turn into sales?
Answering in public tells competitors your price and gives the commenter nothing to reply to. Writing "check your DMs" by hand hours later loses most of them, because the interest was in the moment they commented.
The fix is speed and a conversation: a private message within seconds that asks one easy question.
How should you write the caption call to action?
Tell people exactly what to comment and what they get. One keyword per post keeps it simple.
- "Comment SIZE and I'll DM you the size chart and today's price."
- "Comment MENU for this week's specials in your DMs."
- "Comment BOOK to get the free times this week."
- Pin a reply under the post repeating the keyword for late scrollers.
What should the first private DM say?
Short, personal and ending in a question with an easy answer. Do not paste the whole catalogue.
Example: "Hi Nour! The linen set from the Reel is 890 EGP, in beige and olive, sizes S to XL. Which colour do you want to see on a real photo?"
When they answer, the chat is theirs, and you can continue freely within Instagram's 24-hour window.
How do you move from DM to a paid order?
Once the customer replies, reduce every step left:
- Confirm item, size and colour in one summary message.
- Ask for name, phone and address in one message, not three.
- Offer the payment methods you accept: cash on delivery, transfer, card link.
- Move to WhatsApp if your team closes orders there, with a link that opens a chat.
- Send the confirmation and delivery time in writing.
What are Instagram's rules for comment-to-DM?
Through the official API, Instagram allows one private reply per comment, and caps private replies at 750 an hour per account. After the person answers, normal DM rules apply: reply within 24 hours of their last message.
Facebook Pages work the same way through Messenger. TikTok does not let businesses DM someone who only commented; there, a public reply invites them to message you.
Which posts get the most keyword comments?
Posts that show a specific product with a visible benefit and a reason to ask now. Try-ons, before-and-after results, a limited drop or a this-week menu outperform brand posts.
Give the keyword a payoff people want privately: the price, a size chart, a discount code, free booking times. If the answer could sit in the caption, people will not bother to comment.
Which numbers show it is working?
Track per post:
- Keyword comments and private replies sent.
- Share who replied to the first DM (if low, rewrite its question).
- Orders or bookings from those chats.
- Revenue per post, so you know which content to repeat.
Step by step
- 1
Pick the post and the keyword
Choose a post or Reel with buying intent and one keyword that is easy to type and unlikely to appear by accident.
- 2
Write the caption call to action
Say what to comment and what they will receive in their DMs.
- 3
Set up the automatic private reply
In an official comment-to-DM tool, link the keyword to a short first DM that ends with a question.
- 4
Decide who continues the chat
Let an AI agent answer follow-up questions and collect details, and flag ready buyers or unusual requests for a person.
- 5
Tag and follow up
Tag commenters by post and interest, and send one helpful follow-up within 24 hours to those who went quiet.
- 6
Compare posts weekly
Check which posts produced chats and orders, and reuse their format and keyword.
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Frequently asked questions
Does comment-to-DM work on Reels?
Yes. Comment keywords work on posts and Reels through the official API.
Should I also reply publicly to the comment?
A short public reply ("Sent you a DM!") shows others you respond fast and nudges them to check their requests folder.
What if the person has DMs from strangers in requests?
Private replies to comments can land in message requests. The public reply helps them notice it.
Can the same person get the DM twice?
Good tools process each comment once. Chatmizer, for example, answers every comment once even when Instagram notifies it twice.
Can I do this on Facebook and TikTok too?
Facebook supports a private reply on Messenger. TikTok only allows a public reply inviting the person to message you.
Read next
Answer every message, on every channel
Chatmizer puts WhatsApp, Instagram, Messenger and TikTok in one inbox, with an AI agent that replies in seconds and hands over to your team when a person is needed.