Lesson 6 of 6 · 9 min read · intermediate
Search, social and AI: the biggest ad businesses and the newest
How search and social ads work, why they dominate spending, and how ads are arriving in AI search and assistants like Google AI Mode and ChatGPT in 2026.
Most of the world's digital ad money does not flow through the open-web auctions this academy spends so much time on. It flows into search engines and social apps, which sell their own ads, run their own auctions and measure their own results. And in 2026 a new channel is forming inside AI assistants that answer questions instead of listing links.
Search ads are a shop sign that lights up the moment you say what you want. Social ads are a friend's party where the host knows your tastes and slips in recommendations. AI assistant ads are a personal shopper who answers your question and then mentions that a brand paid to be in the room.
Search advertising
Search advertising shows ads next to results for a query. Advertisers choose words to target through keyword bidding, write short text ads, and pay per click (CPC). The search engine runs an auction for each query, ranking ads not only by bid but by predicted relevance, captured by metrics like Google's Quality Score. Search is the original contextual targeting: the query itself tells you intent.
| Market | Main search ad platforms |
|---|---|
| US, Europe, India, Brazil | Google, with Microsoft Bing a distant second |
| South Korea | Naver alongside Google |
| Japan | Google and Yahoo! JAPAN (LY Corporation) |
| China | Baidu |
| Everywhere | Retail search on Amazon, Flipkart, Mercado Libre and others, where sponsored products behave like search ads |
Paid social
Paid social means ads inside social feeds, stories, short videos and messaging: Meta (Facebook, Instagram, WhatsApp), TikTok, YouTube, Snapchat, Pinterest, LinkedIn and X, plus regional giants such as LINE in Japan and Kakao in Korea. Targeting uses logged-in first-party data, and after App Tracking Transparency the platforms rebuilt measurement around modelled conversions, Conversions API feeds from advertisers' servers, and automated campaign products that pick audiences and creatives by machine learning. Influencer marketing and creator ads, where brands pay people rather than platforms, have become a channel of their own.
Search
- Intent: the user asks for something
- Priced mostly per click
- Short text, shopping and local ads
- Measured by clicks, conversions and ROAS
Social
- Discovery: the user is scrolling, not searching
- Priced per impression or optimised for outcomes
- Video, images, creators and stories
- Measured with platform attribution, lift tests and MMM
Ads in AI search and assistants
As people ask AI tools instead of typing keywords, platforms are working out where ads belong. This is Ads in AI assistants and AI search, and the picture is still moving, so treat the details below as a snapshot as of late 2026.
| Platform | State of ads |
|---|---|
| Google AI Overviews | Search and Shopping ads can appear in or around AI-generated summaries; Google expanded them to desktop and more countries during 2025 |
| Google AI Mode | Google began testing ads within and below AI Mode responses in 2025, starting in English in the US |
| ChatGPT | OpenAI announced in January 2026 that it would test ads for logged-in adult users on the Free and Go tiers in the US, labelled and separate from answers, with paid tiers such as Plus and Pro kept ad-free; ads began rolling out in February 2026 |
| Microsoft Copilot | Shows ads in some conversational answers, drawing on Microsoft Advertising |
| Perplexity | Tested sponsored follow-up questions from late 2024, then according to trade press stepped back from advertising in favour of subscriptions |
The open questions are big. Will AI answers cut clicks to publishers, starving the open web? How do you label an ad inside a conversational answer so users are not misled? Should an assistant's memory of past chats be used for targeting? Regulators in the EU and elsewhere are watching, and platforms say ads will not influence the answer itself.
Invalid traffic in search, social and AI
- Click fraud: bots and competitors click CPC search ads; platforms filter and refund an invalid click but do not catch everything.
- Search arbitrage: sites buy cheap traffic, then send it to search-feed pages full of ads, a model that has long attracted low-quality and bot traffic.
- Fake engagement: Click farm operations and bot accounts inflate social likes, views and follower counts, which matters most in influencer deals.
- AI agents as visitors: AI crawlers and agentic browsers that act for users can load pages and even click, blurring the line between GIVT and human traffic. Declared, well-behaved crawlers are easy to filter; undeclared ones are a growing challenge.
Key takeaways
- Search and social are the two largest digital ad channels; in the US, social edged past search in 2025, per IAB/PwC.
- Search ads are intent-based and priced per click; social ads are discovery-based and use logged-in data.
- Google shows ads in AI Overviews and has tested them in AI Mode; OpenAI began testing ads in ChatGPT in 2026.
- AI assistant advertising raises new questions about labelling, targeting and publisher traffic.
- Click fraud, search arbitrage, fake engagement and AI agents are the main traffic-quality concerns.
Questions people ask
Does ChatGPT show ads?
OpenAI announced in January 2026 that it would begin testing ads in ChatGPT for logged-in adult users on the Free and Go tiers in the US, with ads labelled and shown separately from answers. It said paid tiers such as Plus, Pro, Business and Enterprise would not show ads, and that ads would not influence responses. Availability may have changed since, so check OpenAI's current policies.
Are there ads in Google AI Overviews?
Yes. Google shows Search and Shopping ads in or around AI Overviews when relevant, and expanded them to desktop and to more countries during 2025. It has also tested ads within and below responses in AI Mode, its conversational search experience. Advertisers generally reach these placements through existing Google Ads campaigns rather than buying them separately.
What is the difference between search ads and social ads?
Search ads appear when someone types a query, so they target stated intent and are usually priced per click. Social ads appear in feeds while people browse, so they rely on logged-in profile data and interests to create demand, often priced per impression or optimised for conversions. Many advertisers use search to capture demand and social to create it.