Meta Ads Updates: September 2026 Changelog for Media Buyers

Meta is taking the placement checkboxes out of ad sets. What replaces them is a value rule, which can cut a bid by 90 percent but cannot switch a placement off, so any brand-safety exclusion you built at the ad set level is about to turn into a discount. Beyond that, the ads MCP server got a permissions panel that shipped with all seven write actions switched on, Meta AI can now read your ad account, US teens got a two-hour daily clock, and Ads Manager logged one delivery outage in a month when Reddit called eight more.

The August edition of this changelog covered July 12 through August 7, and this one picks up from August 8.

August 20: Placement exclusions are leaving ad sets

Jon Loomer published the in-product notice on August 20, and it reads: "Excluding placements, platforms, devices and operating systems will no longer be available for your ad sets." There is no date on it. Loomer's read, which he is careful to call unofficial, is that this applies to Sales and Leads objectives and to accounts on the new multimedia ad creation workflow, and that sensitive verticals are exempt. Meta itself has said nothing, and its own help page still walks you through unchecking placements step by step, which tells you how coordinated this rollout is.

The replacement is a placement value rule. Meta's help page says you can "increase bids by up to 1000% or decrease bids by up to 90%," with two criteria per rule, ten rules per set and one set per ad set, and it adds that bid multipliers fold into value rules "by 2027." Loomer counts seven placements you can write a rule for, Audience Network among them. The problem is that a 90 percent cut is still a bid, and a cheap enough auction will still clear it, so an exclusion you built to keep a client off Audience Network has just become a discount on Audience Network.

The one hard switch you have left is account-level Placement Controls, under Advertising Settings, Account Controls, and it applies to every campaign in the account, so an agency running several clients through one account cannot use it for just one of them. Meta's number for why you should like this trade is 11.7 percent lower CPA on Advantage+ placements than manual, and it published that number without a sample size, a date range or a vertical mix.

What to do: open every Sales and Leads ad set that excludes anything and write down what it excludes. Then build the matching value rule at minus 90 percent now, so that on the day the checkboxes vanish you are not rebuilding from memory. If a contract or a regulator says a placement must never run, move that account to account-level Placement Controls. After that, watch the placement breakdown weekly for spend drifting into Audience Network and in-stream.

August 11: The MCP permissions panel shipped with every switch on

You can skip this one if no AI agent is connected to your ad account. If one is, Meta added controls to the ads MCP server it opened on July 16, and Jon Loomer went through the defaults on August 10. Setup now lets you expose only your current Pages and accounts instead of "all current and future," nearly 100 tools can be set to allow, block or ask on the connector side, and a new panel at Business Settings, Integrations, Ads MCP Server lists every ad account and catalog the agent can reach. Loomer's accounts, though, all came up as 7 of 7 actions allowed, and there is still no way to limit which ad accounts an agent sees at setup.

What to do: open the panel today and switch off "edit or set any budget" and the three create actions on every account the agent has no business writing to. A reporting agent needs none of the seven. And if you use Claude Code, since August 12, mcp.facebook.com/ads has been timing out at 30 seconds from the CLI, even though it works from claude.ai on the web, and the issue is still open. The buyer side of agent access is in our guide to connecting Claude to Meta ads.

August 19 to 26: Meta AI reads your ad account, and Ads Manager rates your creative diversity

Meta AI for small businesses launched on August 19. You connect it to your Meta ads, your Facebook and Instagram analytics and your Google Workspace, and it audits campaigns, diagnoses creative and budget, and builds you a deck, all separate from the MCP server above. It is free to start, and heavier use goes behind a Meta One subscription later.

A creative diversity metric was live in Ads Manager by August 26, under Columns, Customize columns. It rates each ad set Low, Medium or High, and Meta's own definition calls it "estimated and in development." When Akvile DeFazio checked it, accounts she was running with statics, video, UGC and carousels all came back Low. That tells you the score is comparing how alike your images and video thumbnails look.

Estimated spend, new on August 25, projects your average daily spend at your cost per result goal, and it is modelled on the last two days of similar campaigns, which is to say two days of other people's campaigns, so treat it as a guess with a decimal point. Reply to Keywords, from the same day, is Instagram only and still in test, and it fires an automatic DM when someone comments one of up to five keywords on your ad, which is the native version of the comment-to-DM tools you currently pay a subscription for.

What to do: add the creative diversity column to your top five ad sets and log the rating next to each CPA, so that by Q4 you can see whether it predicts anything. And run Reply to Keywords on one campaign before your next comment-to-DM renewal.

August 26: US teens get a two-hour clock, and Meta leaves guidance alone

Meta settled with a bipartisan group of attorneys general, 52 by its own count, and the consent judgment that took effect on August 27 gives it until February 27, 2027 to have the product changes live. Those changes are a default two-hour daily cap for ages 13 to 17, counted across Facebook and Instagram, a midnight-to-6am block, hidden likes, and options to switch off autoplay and personalization. The judgment schedules $11.66 billion guaranteed plus $5.02 billion if YouTube and TikTok match the terms.

On the investor call, Meta's CFO said teens are "less than 1% of Meta's revenue," that the average US teen already uses Instagram about an hour a day, and that "our Q3 revenue outlook remains unchanged," so do not expect any CPM relief from this.

Meta told investors much the same in 2021, when Apple shipped App Tracking Transparency with iOS 14.5, and buyers spent the next year rebuilding attribution while CPAs climbed. Meta's revenue recovered, and the signal never fully did. The teen clock is a smaller event than ATT. Still, a teen who hits hour two is on WhatsApp and watching 22-minute video, because neither counts toward the cap, but they are not scrolling past your Reels ad any more. So if you sell to 13 to 17s, your impressions now have to fit inside the same two hours every other teen brand is bidding for. Does that push teen CPMs up? It should, if teen budgets stay put while the hours shrink. Meta's answer is that most teens are under the cap already, so the first quarter may show nothing, which is roughly how ATT's first quarter looked too.

Meta's own open letter to TikTok and YouTube admits where the hours go, because it says "when teens are restricted on one app, they simply move to another." Adweek's buyer panel expects teen reach to soften over 12 to 18 months, with gaming, fast food and fashion most exposed. In Australia, Meta removed 756,000 under-16 accounts between December 1 and June 30, so any lookalike you seeded from Australian data before December was built on people who are no longer in the pool.

What to do: do not rebuild anything this month. Instead, pull your teen and young-adult baselines now, meaning reach, frequency, CPM, placement mix and conversion quality, so that when the numbers move in Q1 you can show the change. Judge teen video on its first frame, because a teen with autoplay off sees a thumbnail. And if you run Australia, reseed the lookalikes.

August 21: One confirmed outage, eight more claimed

Meta's status history shows one Ads Delivery incident in the window, on the evening of Friday August 21, while Reddit called an outage on eight other days. The loudest of those was August 24, when the thread on r/FacebookAds ran to 57 upvotes and 71 comments, and Meta logged nothing that day on any of its 17 status pages. However, August 24 and 25 are the days placement controls vanished from ad sets, so it was likely a new deployment that reset ads learnings and got read as an outage.

On the publisher side, Audience Network revenue reporting was down from August 8 to 17 and again on August 23, which means the people supplying your Audience Network inventory were blind for about a third of the month. That same weekend, an agency on r/PPC reported that Meta disabled the profile behind several client accounts 68 minutes after sending its own 48-hour verification email, which is what automated account review looks like from the outside.

What to do: annotate the evening of August 21 in every reporting view, and before you blame creative for a campaign that died that Friday night, line it up against the incident. For anything that died on August 24, check the placements tab before anything else. And if a verification email lands, act on it that hour, because the deadline in the email is not the one Meta is using.

August 13 to 27: The API changes that reach a buyer's dashboard

You can skip this section if nobody on your team touches the Marketing API or a reporting connector.

If your dashboard has shown zeros for device, hourly or frequency since August 6, the switch to turn them back on is now documented. The breakdowns page lets a vendor enable each one per account with a POST to /act_<ID>/insights/feature-settings, the data shows up within about a day, and async report jobs are gated too. Ask your connector vendor which of your accounts it has enabled.

If you build on facebook-business-sdk, 26.0.1 shipped on August 25 with empty release notes and dropped 14 ad set fields that were in 26.0.0, time_start and budget_schedule_specs among them. Messenger Stories leaves messenger_positions on October 27 per the changelog, and Meta already strips it from v26.0 calls.

If you run an app with Facebook Login, the iOS flow changed on August 27. Fast App Switch is on by default from SDK 18.0.3, "with no code change on your part," and it routes logins through the native Facebook app instead of the in-app browser, so watch your registration rate and your CAPI match rate and set appSwitch: .disabled if either drops. WhatsApp marketing messages also reached the Marketing API on August 13, per the out-of-cycle changelog, so tools can buy and report them now.

What to do: pin 26.0.0 or diff before you take 26.0.1, and treat Messenger Stories as gone by October 27.

August 7 to 18: Exclusion-only audiences, the holiday playbooks, and the IAB label rules

Exclusion-only custom audiences were live in Ads Manager by August 7, unannounced and undated on the help page. It is a customer list that can only exclude, which Meta positions for opt-outs and do-not-target obligations. Put your employees on it, and anyone who has asked you to stop.

Meta's three-part holiday series, published the week of August 11, is guidance rather than product. The two numbers to keep are 2.1x higher purchase intent when shoppers see three or more creative formats, and a Conversion Lift that reaches significance in two to three weeks during peak against six or more weeks off-peak. Six weeks from today is mid-October, which is the last off-peak read you will get before Q4 budgets lock.

The IAB AI Transparency Framework v2 landed on August 18. Disclosure is "generally not required" for text and copy, it is required for photorealistic AI imagery, and if the platform fails to render the label the obligation is still yours. Read that next to the NYU Stern study from last November, which measured a 31.5 percent drop in click-through rate when an ad carried an AI disclosure, and remember that Meta has auto-detected and labeled third-party AI media in ads since June 1, so your photorealistic AI creative may already be wearing the label whether you chose it or not.

What to do: build the exclusion-only list this week. Start any Conversion Lift now. If your creative uses photorealistic AI people, run the labeled-against- unlabeled test the July edition asked for, because 31.5 percent is the size of the bet.

August CPMs: three sources say up, one says down

Triple Whale refreshed on August 28 with a median Meta CPM of $15.06 across 40,000 brands for August 2025 through July 2026, up 13.24 percent, with 16 of 17 industries up and Health and Wellness at $21.80. Tinuiti's Q2 report has Facebook CPM up 13 percent on impressions down 5 percent, and Meta's own filing says price per ad is up 12 percent. Superads' July median is $16.47, down 12.7 percent year over year, one month after it said up 16.5, and it has not been revised.

Most of the gap is method. Superads reports a single month, the others report a quarter or a trailing year, and Meta's Q2 call has the price increase "partially offset by strong impression growth, particularly from lower-monetizing surfaces and regions," which is Meta telling you it flooded the auction with cheap inventory and still raised the blended price. Reddit's August CPM complaints ran from "doubled" to plus 227 percent, but they were all week over week, none of them year over year, and most sat at one to three upvotes, so they tell you about individual accounts and not about the auction.

What to do: benchmark August against your own trailing three months. If your CPMs rose with the trackers and results held, that is Q4 arriving early. If they rose and results fell, pull the placement breakdown before you touch creative, because a shift into cheap surfaces can look exactly like creative fatigue from the campaign view.

The August calendar, audited

Last month's edition put dates in your calendar, so here is what each one did.

Dates to put in your calendar

We are back in early October with everything from September 1 onward.

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