SEO, PPC & Digital Marketing News: The Only Things Worth Acting On This Week (Late September 2026)
Another fortnight, another spam update, and a batch of platform changes that are easy to miss while you’re getting on with actual work. Here’s what genuinely changed, why it matters, and what to do about it before Monday morning.
TL;DR: The Practical Takeaways
Skim this table. If a row looks relevant, jump to the section.
| # | The Change | The Practical Takeaway | Priority |
|---|---|---|---|
| 1 | Google September 2026 spam update rolling out (started 24 Sept) | SEO: Don’t touch anything for 2 weeks. Wait for the rollout to complete around 8 Oct before diagnosing traffic changes. | 🔴 Critical |
| 2 | Search Console multimodal filter launched (24 Sept) | SEO: Open Search Console this weekend. Set Search Type, then Web: multimodal, to see Google Lens and Circle to Search traffic you couldn’t see before. Especially useful for anyone with product photos. | 🟠 High |
| 3 | ChatGPT Ads: Sponsored Agents, Shopify app, 5-way platform targeting (16 Sept, global 23 Sept) | PPC: If you’re already testing ChatGPT Ads, switch to oCPM bidding and set separate platform targeting. Shopify merchants should install the ChatGPT Ads app for direct feed integration. | 🟠 High |
| 4 | Chartbeat: publisher search traffic down 40.2% YoY (reported 24 Sept) | Digital marketing: Diversify. Any business plan that assumes organic traffic will grow needs rewriting. Direct traffic, email lists and branded search are where the survivors are landing. | 🟠 High |
| 5 | Google research paper on R4T-Diffusion query fan-out (15 Sept) | SEO: No immediate action. Long-term signal that AI answers will keep pulling from more sub-queries per prompt. Write pages that answer clusters of related questions, not single keywords. | 🟡 Medium |
| 6 | Google Business Profile spam review alerts now sending | Local SEO: Nothing to do proactively. Watch your inbox for GBP notifications about spam review spikes so you can flag them fast. | 🟡 Medium |
1. Google’s September 2026 Spam Update: Sit on Your Hands for Two Weeks
Google confirmed the September 2026 spam update on Wednesday 24 September at 09:15 Pacific. It applies globally, in every language, and Google says the rollout may take up to two weeks. That means the earliest it finishes is around 8 October.
Two things stand out about this one.
First, the length of the stated window. The three previous 2026 spam updates each ran a few days at most. March finished in 19 hours and 30 minutes. This one has been given a fortnight. That is the same window Google typically hands to its core updates, which is worth noting even if the update itself is not a core one.
Second, the pattern. This is the fourth spam update in 2026, following March, June and August. Google runs these to improve its automated spam detection systems, not to introduce new policies. Nothing has been added to the rulebook.
What to do
- Nothing dramatic. Day one to fourteen of a spam update is for diagnosis, not for changes.
- Note the start date (24 Sept) somewhere you’ll remember. When you look at Search Console in October, line up dips or spikes with it.
- If you were hit by the August spam update, the September one is not a second chance to recover. Recovery from spam updates is measured in months, sometimes multiple update cycles.
- Don’t panic-rewrite AI-assisted content unless you already had real reasons to. Independent analysis of the August update showed the sites hit hardest were the ones publishing mass-generated content, not the ones using AI as a writing aid.
2. Search Console’s Multimodal Filter: A Weekend Job Worth Doing
On the same day the spam update landed, Google quietly rolled out something more useful: a new filter in Search Console’s Performance report called Web: multimodal.
It shows how your pages perform when someone searches using an image instead of typed text. That covers Google Lens, Circle to Search on Android, image uploads to Google Search, and Chrome’s right-click “Search this image”. All four are grouped together, so you can’t split them out, but this is data that was completely invisible before.
One catch: the Queries tab doesn’t work with multimodal. You see clicks, impressions, pages, countries and devices, but not what image or what text the searcher used. Which makes sense; there is no text query behind a Google Lens photo of a lamp.
Why it matters more than it looks
Anyone with product photography now has a measurable channel that used to be a mystery. If someone points their phone at your competitor’s product in a shop and Google Lens surfaces your page, that click has always existed. You just couldn’t count it. Now you can.
What to do (10 minutes on Sunday)
- Sign in to Search Console.
- Open Performance, then Search results.
- Click the Search type filter (defaults to Web).
- Choose Web: multimodal.
- Set the date range to include 10 Sept onwards. That’s the earliest date multimodal data is available.
- Export the pages tab as CSV. That’s your baseline.
If your top multimodal pages differ from your top text-based pages, you’ve just found which pages are quietly earning visual-search traffic. Optimise their images, alt text and structured data accordingly.
3. ChatGPT Ads Grew Up in One Week (16 Sept)
OpenAI shipped a lot on 16 September, and then rolled the biggest piece globally on 23 September. If you’re advertising on ChatGPT, or planning to, this is where the platform actually became viable.
| Update | What it does | Who it’s for |
|---|---|---|
| Sponsored Agents (in test) | Users can click an ad and start a labelled conversation with an advertiser’s own AI agent | High-consideration purchases, complex products, B2B |
| Shopify app | Direct product feed integration for ChatGPT Ads. US on 16 Sept, rest of the world 23 Sept | Any Shopify merchant |
| HubSpot integration | Build and manage ChatGPT campaigns from inside HubSpot | HubSpot users doing paid |
| Ads Manager plugin | Create, update and analyse campaigns through natural-language prompts in ChatGPT Work | Agencies, in-house teams |
| oCPM billing | Optimises for conversions from both clicks and views, billed on impressions. Now generally available and OpenAI’s recommended bid model | Most performance advertisers |
| 5-way platform targeting | Separate targeting for Android app, Android web, desktop web, iOS app, iOS web | Anyone whose funnel behaves differently by device |
| Adjustable attribution windows | 7, 14 or 30-day click windows; 0 or 1-day view window | Sensible measurement setups |
The practical takeaway
If you’re already spending on ChatGPT Ads, three changes matter this week. Switch to oCPM unless you have a specific reason to use CPC. Set separate platform targeting if your mobile web experience differs from your app. And if you’re a Shopify merchant, install the app so your feed pipes through directly.
If you’re not spending yet, this is still not the time to jump in aggressively. But it is the time to install the OAIQ pixel and set up conversions, so you have baseline data ready when you do test.
4. The Publisher Traffic Data That Should Change How You Plan
Chartbeat published its 2026 Publisher Playbook, and the numbers are worth staring at for a minute. Reported on 24 September:
- Google Search traffic to publishers fell 40.2% year-on-year between July 2025 and July 2026 across Chartbeat’s network. The year before, the drop was 21.9%. The decline is accelerating, not slowing.
- Google Discover traffic fell 34.3% in the same period. Which matters because Discover was the channel a lot of publishers hoped would offset search losses.
- AI referrals grew 8x in two years, but are still only 0.01% of publisher traffic. In other words, they are not filling the gap. Not yet, probably not soon.
- The smaller the site, the harder the hit:
What to actually do about it
For most small businesses (not publishers), the specific figures matter less than the direction. Any strategy that assumes Google organic will grow next year needs a plan B.
- Build a mailing list, even if it feels boring. Direct traffic and email are the categories that held up.
- Focus content on things that can’t be summarised in two sentences. First-hand data, local expertise, genuinely proprietary knowledge.
- Treat branded search as a KPI. When someone Googles your business by name, AI Overviews rarely intercept the click, because there’s nothing to summarise.
5. Google’s R4T-Diffusion: The Research Paper Worth a Ten-Minute Read
On 15 September Google Research published a blog post explaining a new query fan-out framework called R4T-Diffusion, or Retrieve-for-Train. The details are technical. The implication is straightforward.
Current AI search generates sub-queries one at a time from the model. The paper describes generating them in parallel via a diffusion retriever, 12x to 20x faster, and cheaper. Google describes it as “production-ready” for scale.
Why it matters for SEO
If Google can generate more sub-queries per user prompt without the cost blowing up, AI Overviews and AI Mode will pull from a wider set of pages per answer. That rewards content that covers a cluster of related questions rather than a single narrow keyword. Which is what Google has been saying for two years, but now the infrastructure catches up with the advice.
Nothing to do today. But when you’re planning your next content refresh, ask: does this page answer the obvious question, the follow-up question, the objection, and the comparison? If yes, it’s more likely to survive.
Quick-Fire Round-Up
| Update | What Happened | Practical Takeaway |
|---|---|---|
| Google testing new sitelinks across organic and ads (22 Sept) | Sitelink design tests expanding beyond sponsored-only | PPC + SEO: Watch your CTR data. Nothing to change yet |
| Google testing AI Overviews linking to AI Mode | Links inside AIOs now sometimes point to Google’s own AI Mode | SEO: Another route for clicks to stay on Google. Focus on the answer, not the click |
| Google Business Profile spam review alerts | Google now emails business owners when a spike in fake reviews is detected | Local SEO: Check your GBP notification settings are on |
| Google Business Profile “Permanently closed” option missing | UI change; unclear if intentional | Local SEO: If a business genuinely closed and you can’t mark it, contact Google support |
| Google Ads: gun accessory ads allowed in US for 6 months from October | Policy relaxation, US only | PPC: Not relevant unless you sell in that category |
| Search Console crawl stats report missing 15 Sept data | Second reporting glitch this month | SEO: Cross-check with GA4 and server logs; the raw data is fine |
Your Weekend Checklist
- ☐ Open Search Console and pull a baseline of Web: multimodal traffic
- ☐ Note the September 2026 spam update start date (24 Sept) alongside your traffic charts
- ☐ Don’t touch spam-affected pages until the rollout finishes around 8 October
- ☐ Check GBP notification settings for spam review alerts
- ☐ If running ChatGPT Ads: switch to oCPM and check platform targeting
- ☐ If on Shopify: install the ChatGPT Ads app if you’re testing
- ☐ Sanity-check your 12-month traffic forecast against the 40% publisher decline data
The Bigger Picture
Two themes cut through late September. First, Google is quietly making it easier to see AI-adjacent data (the multimodal filter, the generative AI performance report, better spam update transparency) even as it makes it harder to earn a click. Visibility is going up. Traffic is going down. Both trends will continue.
Second, the platforms have stopped pretending that “test and see” is a strategy small businesses can run indefinitely. ChatGPT Ads now has proper targeting and billing. Google’s spam updates now come with core-update-length rollout windows. The kit is professional; the effort required is professional too.
None of which means the sky is falling. It just means the businesses that plan around AI-era search, with clear pages, real expertise, a direct audience relationship, and honest measurement, keep pulling ahead of the ones waiting for things to go back to normal.
Sources for this round-up include Search Engine Land, Search Engine Roundtable, Search Engine Journal, Search Engine Watch, Google Search Central Blog, Google Research, OpenAI, Chartbeat’s 2026 Publisher Playbook, and reporting from Digital Applied, PPC Land, Qwestyon, Common Thread Co. and Coalition Technologies. Snapshot as of Sunday 27 September 2026.
