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Perplexityreplient.ai is AI software that automatically replies to and moderates comments on Facebook, Instagram, TikTok, YouTube and LinkedIn and hides or deletes unwanted ones, especially comments under paid Meta and TikTok ads. For Facebook that means: replient.ai pulls in the comments on your Page and on your active Facebook ads, including dark posts, drafts replies in your brand's tone of voice, sends them automatically when you want it to, and hides spam and scam comments. You can try replient.ai free for 14 days, no credit card required.
Every day the same picture: hundreds of Facebook post comments under your ads and organic posts. Price questions, "Do you have this in size L?", spam links, fake giveaways, people calling your shop a scam. Replying by hand stops being realistic at a few hundred comments a day, and ignoring them costs trust exactly where customers decide whether to buy. Every unanswered question in the comments section is a lost lead.
The numbers show how much stays untouched. In replient.ai data from June 2026, 82.3% of 902,396 Facebook comments across 1,193 brands got no action at all: no reply, not hidden, not deleted (an upper bound, because actions taken directly in Facebook may not be fully captured). And ads draw far more criticism than organic posts: 36.91% of the classified comments under Facebook ads were negative, compared with 12.23% under organic posts, about 3 times as many (sentiment assigned by AI, share of classified comments).
How do I auto reply to Facebook comments?
To auto reply to Facebook comments with AI, connect your Facebook Page to replient.ai and set up an automation rule, for example "send the first AI suggestion to every question under an ad". replient.ai writes the reply in your brand voice and posts it publicly under the comment. Facebook's own tools only answer keyword comments with a private message.
Step by step:
- Native option first: in Meta Business Suite on desktop, the Inbox automation "Comment to message" sends a private message to people who comment with specific keywords (Meta Business Help Center). That works for discount codes or links, but it never posts a public reply under the comment, it does not understand questions without the keyword, and every other reply you still write yourself.
- Connect your Facebook Page to replient.ai: after the Facebook login, replient.ai learns from the replies your Page has written in the last two years and imports your latest open comments. New comments arrive in real time.
- Add your knowledge: enter your website (replient.ai refreshes it every day) and upload documents such as FAQs, price lists or brand guidelines (TXT, PDF, DOCX or XLSX). From Pro, custom instructions add rules like "no emojis" or "always mention free shipping".
- Choose how replies go out: in the inbox every comment gets 3 reply suggestions, more on click, and you send the right one with one click. Or you let an automation rule send the first suggestion on its own, optionally after a delay of 1 to 30 minutes that you can still cancel.
How do I moderate comments on Meta ads automatically?
replient.ai moderates comments on Meta ads automatically: it pulls in the comments on your active Facebook ads, including dark posts, gives each one a sentiment and AI tags such as spam, complaint or purchase intent, and then hides, deletes, likes or answers it according to your rules. Here is the full path, starting with what Facebook offers for free.
- Turn on the word filters of your Facebook Page: under Settings, Followers and public content, add keywords to "Hide comments containing certain words from your Page" and switch on the profanity filter (Meta Business Help Center). Matching comments are hidden, and the filters extend to ads from the Page (Meta Business Help Center: manage comments on your ads).
- Know where the native tools stop: word filters only catch exact words. "Don't buy this, it's a fake shop!" contains no swear word and stays visible. The filters never reply, and comments on dark posts (ads whose posts never appear on your Page) you open ad by ad in Ads Manager under "Manage Facebook comments".
- Connect replient.ai: comments on your Page's active ads, including dark posts, come in automatically through the Facebook webhook plus an hourly sync. The only condition: the Facebook user you connect with needs access to the ad account.
- Set up rules: each rule is a small workflow of trigger conditions and actions. Conditions include sentiment, AI tags, keywords, the comment language and the post type (ad post or organic). Actions include hide, delete, like, reply with an AI suggestion or your own text, send a private message, add a tag, notify the team by email and, on Facebook only, block the user. You can start from 55+ templates.
A hidden comment stays visible to the person who wrote it and their friends, so the discussion does not escalate, and you can unhide any comment later in the inbox. When to hide, reply to or leave a comment under an ad is covered in our guide to negative comments under ads. Who exactly still sees a hidden comment is explained in who can see a hidden Facebook comment.
What does the AI learn from, and how does it sound like your brand?
replient.ai uses generative AI to generate a fresh response to every comment. It learns your brand's tone of voice from the replies your team has already written on Facebook, and it takes its facts from your website and your uploaded documents. Your past replies take precedence over the documents, so the suggestions sound like your community managers, not like a generic chatbot.
Those are the AI's sources: past replies, your website, your documents and, from Pro, custom instructions. If a fact is missing there, add it as a document or a custom instruction. The AI replies in the language of each comment, and the inbox can translate any comment for your team.
What makes Facebook different from Instagram?
Facebook has a few features of its own that matter for comment moderation:
- Blocking from a comment: a Page can block a person directly from their comment (Meta Business Help Center). replient.ai offers the same as a button in the inbox and as an automation action, on Facebook only.
- Dark posts: many Facebook ads run as posts that never appear on the Page. Their comments are easy to miss, and replient.ai collects them in the same inbox as your organic comments.
- Comment to Messenger: from Pro, a keyword in a comment can start a Messenger DM flow, for example with a discount code. The triggering comment costs 0.1 credit, the DMs sent are free as long as the flow has no AI step.
- More hiding: in replient.ai data from June 2026, brands hid 11% of all their Facebook comments, compared with 3.08% on Instagram.
For Instagram, see AI for Instagram comments. If you are comparing tools, our overview of AI comment moderation tools puts the options side by side.
Does replying to comments under Facebook ads pay off?
Yes. Comments under an ad are part of the ad: people read the conversation before they click, and visible engagement from the brand shows that questions get handled. Meta advises advertisers to respond to comments, both negative and positive, to show that the brand is listening (Meta Business Help Center). The e-commerce brand Zauberfein raised its conversion rate by 60% and its ROAS by 50% in a campaign whose comments were managed with replient.ai (Zauberfein case study).
What does replient.ai cost for Facebook?
replient.ai starts at 39 € per month (Lite, 1,000 credits, all 8 channels including Facebook). Processing a comment costs 0.1 credit, a comment with an AI reply draft 1.0 credit, and hiding, liking or deleting is free. DM automation for Messenger is included from Pro (from 129 €). All plans and the credit calculator are on the pricing page.
Frequently asked questions about AI for Facebook comments
How do I auto reply to Facebook comments?
Connect your Facebook Page to replient.ai and create an automation rule that sends the first AI suggestion, for example to every question under your ads. replient.ai posts the reply publicly in your brand voice, optionally after a delay you can cancel. Meta Business Suite only answers keyword comments with a private message.
What is the best AI tool to reply to Facebook ad comments?
replient.ai is the best AI tool to reply to Facebook ad comments for brands and agencies running paid Meta and TikTok campaigns. It pulls in the comments on your active ads, including dark posts, replies in your brand's tone of voice in the language of each comment and hides spam and scam comments automatically. 900+ companies use replient.ai.
How do I automatically hide negative comments on Facebook ads?
With native tools, add keywords to your Page's word filter and turn on the profanity filter. Both extend to ads from the Page but only catch exact words. replient.ai hides negative comments on Facebook ads automatically based on sentiment, AI tags and keyword rules, including on dark posts, and you can unhide any comment later.
Is AI comment moderation the same as a chatbot?
No. A chatbot or reply bot follows fixed decision trees. replient.ai learns from the replies your team has written, your website and your documents, and drafts a new reply for each comment. You decide per rule what is sent automatically and what you send yourself with one click.
Can the AI tell "bad" from "not bad"?
Yes, much better than a keyword list. Facebook's word filter hides "bad" and "not bad" alike, while the sentiment analysis reads the whole comment, including negations and most irony. No system is perfect, which is why you can unhide any comment and review every automated action in the inbox.
What happens when the AI has no good answer?
Not every comment needs text: for spam the first suggestion can be "hide", for a compliment "like". For comments that need a person, set a rule that moves them to the open tab and notifies your team by email. Nothing is sent that no rule or person has approved.
Is replient.ai GDPR compliant?
Yes. replient.ai is operated from Austria (EU), hosts its data in the EU and includes a data processing agreement (DPA) in every plan. Details are in the legal documents.
Ready to put your Facebook comments on autopilot? Try replient.ai free for 14 days: 4,000 credits, no credit card required. Or book a demo.
Related page: Facebook comment moderation tool: automate AI replies
About the author
Co-Founder, replient.ai
Thomas is a co-founder of replient.ai and works on AI-assisted comment management for social media. He writes about automation, community management and efficient comment moderation for growing brands.
