Method
We cite primary sources first. Platform claims cite the platform's own documentation or announcement wherever one exists. Trade press is used to verify and date, or when no primary source exists. It is marked secondary.
We label every claim by type. Facts, interpretations and forecasts are labeled as what they are. Forecasts carry a horizon and a confidence level. Reported-but-unconfirmed developments say "reported."
We date every source, claim, and page. Sources carry publication and access dates; undated live documentation is stamped with its access date and says so. Claims carry checked dates. Pages carry published, updated and reviewed dates.
Unverifiable means unpublished. When something cannot be confirmed from a credible source it is marked unknown or left out, including claims that would make the market or the practice sound more advanced than the evidence supports.
The build enforces it. The site is generated from validated content objects, and a fact claim without a source or a forecast without a horizon fails the production build.
The source register
| Source | Publisher | Type | Published | Accessed | Primary |
|---|---|---|---|---|---|
| About ads and AI Overviews | Google Ads Help | help-center | 2026-07-14 | 2026-07-14 | yes |
| A new generation of ads for the AI era of Search | Google · The Keyword | announcement | 2026-05-20 | 2026-07-14 | yes |
| New ways to buy ChatGPT ads | OpenAI | announcement | 2026-05-05 | 2026-08-25 | yes |
| ChatGPT Ads expands across Europe | OpenAI | announcement | 2026-08-18 | 2026-08-25 | yes |
| Ads | OpenAI Developers | documentation | 2026-08-25 | 2026-08-25 | yes |
| ChatGPT Ads are expanding to 31 European countries | Search Engine Land | news | 2026-08-19 | 2026-08-25 | no |
| Testing ads in ChatGPT | OpenAI | announcement | 2026-01 | 2026-07-14 | yes |
| ChatGPT rolls out ads | TechCrunch | news | 2026-02-09 | 2026-07-14 | no |
| Bots: OpenAI crawler documentation | OpenAI | documentation | 2026-07-14 | 2026-07-14 | yes |
| Why we're experimenting with advertising | Perplexity | announcement | 2024-11 | 2026-07-14 | yes |
| Perplexity Pauses New Advertising Deals to Reassess Ambitions | Adweek | news | 2025-10 | 2026-07-14 | no |
| Perplexity pulls the plug on ads, citing trust concerns for AI | Campaign US | news | 2026-02 | 2026-07-14 | no |
| Conversations that Convert: Copilot Checkout and Brand Agents | Microsoft Advertising | announcement | 2026-01-08 | 2026-07-14 | yes |
| Microsoft is about to change how Copilot ads appear and trigger | Search Engine Land | news | 2024 | 2026-07-14 | no |
| Reddit Ads | documentation | 2026-07-14 | 2026-07-14 | yes | |
| Google strikes $60 million deal with Reddit, allowing search giant to train AI models on human posts | CBS News | news | 2024-02 | 2026-07-14 | no |
| The /llms.txt file | llmstxt.org (Answer.AI) | specification | 2024-09-03 | 2026-07-14 | yes |
| Google Says No AI System Currently Uses LLMs.txt | Search Engine Roundtable | news | 2025 | 2026-07-14 | no |
| IndexNow | IndexNow (Microsoft Bing, Yandex and partners) | documentation | 2026-07-14 | 2026-07-14 | yes |
| About offline conversion imports | Google Ads Help | help-center | 2026-07-14 | 2026-07-14 | yes |
| Google's common crawlers | Google Search Central | documentation | 2026-07-14 | 2026-07-14 | yes |