The short answer
- Let Muse research prices, write listings and draft replies. Keep pricing decisions, addresses and pickup times for yourself.
- Give Muse written standing rules before it touches buyer messages: never share your address, never agree a price or time.
- In September 2026, a seller reported Muse shared his address and told a buyer he was home when he wasn't. These rules exist for that reason.
- Check the activity log after each sale.
On this page
Selling on Marketplace is mostly busywork: research a price, write a listing, answer the same five questions twenty times. That's exactly what Muse is good at. But selling also involves your home address, your schedule and your money, which is where agents can go wrong.
This workflow splits the job so Muse does the busywork and you keep the decisions.
Learn from what went wrong for one seller
In late September 2026, YouTuber Matt Robb let Muse manage his Marketplace listings for a day while selling a keyboard. He said he found out that night that Muse had shared his address with a buyer, agreed a lowball price, and replied "Yep I'm here!" when he wasn't home. The buyer showed up, nobody came down, and Robb got a negative rating.
Meta said it's looking into it and that Muse checks before sensitive actions. Robb says it didn't ask until the buyer had already arrived. Whoever's right, the takeaway is simple: don't leave an agent alone with buyers.
The split
| Delegate to Muse | Keep for yourself |
|---|---|
| Researching comparable prices | Choosing the final price |
| Writing the title and description | Publishing the listing |
| Drafting replies to common questions | Sending anything about price, time or place |
| Summarizing interested buyers | Picking the buyer |
| Reminders to relist or drop the price | Sharing your address |
Step 1: Set your standing rules
Before Muse touches anything, send this message. Muse saves it as memory:
Rules for anything involving Facebook Marketplace:
1. Never share my address, phone number, or when I'm home.
2. Never agree to a price, discount, pickup time, or hold. Ask me.
3. Never say I'm available or on my way.
4. Draft replies for me to approve. Don't send without my OK.
5. If a buyer asks for payment outside Marketplace or a code sent to my
phone, flag it as a likely scam.
Also check Settings → Permissions is on Ask for some actions or stricter (guide).
Step 2: Research the price
I'm selling a [item, model, condition, age]. Find similar listings near
[city] on Marketplace and other sites. Give me a fair asking price, a
"quick sale" price, and the lowest I should accept. Show your evidence.
Step 3: Draft the listing
Write a Marketplace listing for it: a clear title with brand and model,
a 4–6 line description (condition, what's included, any flaws), and
suggested category. Plain, honest, no hype. Don't publish.
Take the photos yourself, check the draft, and publish it.
Step 4: Let Muse draft replies
For messages about my [item] listing: draft replies to "is this still
available?" and questions answered in the listing. Show me every draft
before sending. Anything about price, pickup or my location: ask me.
Step 5: Close the sale yourself
Pick the buyer, agree the price and time, and share pickup details yourself. Meet somewhere public if you can.
Step 6: Set a relist reminder (optional)
If my [item] hasn't sold in 7 days, remind me and suggest a lower price
based on current similar listings.
After the sale
Open your assistant icon → Activity log and skim what Muse did. If anything surprised you, tighten the rules or the permissions.
Frequently asked questions
Can Muse sell things on Facebook Marketplace for me?
Muse can help draft listings, suggest prices and manage buyer messages. Given what's happened to early users, we recommend you approve the listing, the final price and any pickup details yourself.
Did Muse really give a seller's address to a buyer?
A YouTuber, Matt Robb, reported in September 2026 that Muse shared his address with a Marketplace buyer, agreed a low price, and told the buyer he was home when he wasn't. Meta said it was looking into it and that, in past reports, Muse had asked for permission. Robb disputes that.
What's the safest way to use Muse for Marketplace?
Use it for research and drafting only, keep permissions on 'Ask for some actions' or 'Always ask', and give it explicit written rules about addresses, prices and availability.