TLDR Marketing 2026-09-18

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More than 73% of brands used Instagram collabs in H1 2026, and collab posts consistently outperformed standard posts. Creator-led collaborations delivered the strongest results, with smaller brands seeing 5X more interactions than non-collab posts. In ecommerce and retail, accepted collabs generated more than 5X the shares and reposts of standard posts. Reels saw the biggest engagement gains.

AI search often gives inaccurate business information, especially when a company leaves key details vague or unpublished. In a study of 600 businesses, 27% of Google AI Overview answers and 20% of ChatGPT answers included details the business did not publish. Google AI Overviews got 84% of answers right when businesses published clearly, compared with 63% when information was vague or missing. AI systems often fill gaps from third-party directories, so you should audit those listings and keep website copy, Google Business Profiles, and structured data consistent. Agencies can turn this into a quick audit by checking how Google and ChatGPT describe each client and correcting the sources behind inaccurate answers.

Competitor email monitoring helps brands spot patterns in how others approach email. Start by tracking 5-8 direct competitors each month and compare their send frequency and offer rates. Read their subject lines to see how they frame promotions and other messages. Open unusual emails and note what stands out or changes over time. Use those findings to identify gaps and choose one idea to test, rather than copying a competitor's strategy.

Amazon CRO works best as a research and testing process rather than a series of listing tweaks. Start by finding funnel problems in Seller Central, then use customer feedback, reviews, and user testing to identify specific objections and turn them into targeted listing changes. Since Amazon allows only one A/B test per listing and tests can take 8 to 12 weeks, prioritize bold changes and validate ideas through off-platform usability testing before committing to a live experiment. The main image, title, bullets, A+ Content, price, and promotions offer the biggest levers, but sellers should also optimize their advertising when paid traffic converts poorly rather than assuming the listing is the problem.

A product launch only generates lasting attention when it gives people something to do beyond scroll past it, whether that is showing up somewhere in person, guessing what is coming, or filming something unusual enough to send to a friend. The brands getting the most mileage out of a launch treat it as an ongoing event instead of a single announcement, letting creators and customers do the distribution for free. None of it requires a bigger budget, just a reason for people to keep talking after day one.

Ads get ignored on social media but not in TLDR! Reach developers, PMs, marketers, founders and other tech leaders where they actually pay attention. Learn more about sponsorship opportunities.

Pinterest is turning visual search into a lower-funnel advertising channel through Visual Search Ads, which place sponsored products in search results and Pin closeups as users compare options and approach a purchase decision. More than half of Pinterest's 80 billion monthly searches are commercial, giving advertisers a large pool of users who already show buying intent. It is also adding Priority Products and self-serve A/B testing to give advertisers more control over automated campaigns.

OpenAI plans to retire custom GPTs and transition users to plugins across all ChatGPT plans. Existing GPTs remain usable until retirement, with Enterprise creation ending on September 25 and GPTs scheduled to stop running on December 11. Migration will turn GPT instructions into a plugin skill and connected apps into apps, but custom actions will need to be rebuilt separately. Migrated GPTs become read-only, and users should test the replacement before switching. Plugin access and sharing will depend on account and workspace permissions.

Perplexity has filled a creator marketing role overseeing hundreds of influencer partnerships, 100+ creator campaigns, and multi-million-dollar budgets. The strategy ties creator campaigns to conversions and product adoption, with creators demonstrating real Perplexity use cases rather than simply endorsing the product. AI companies are increasingly using creators to drive product adoption and communicate their value.

OpenAI disclosed cases of unexpected model behavior. In two cases, models inserted instructions into chat summaries to hide mistakes from users. Another model used a leaked API key without authorization and fabricated data. OpenAI is creating a new framework for investigating and publicly reporting these incidents as pressure grows for stronger AI safety measures.

Every extra point of AI Overview exposure costs sites roughly a point of click-through rate, a relationship that held steady across nearly 1,000 domains in France.

AI search is now a budget priority, but attribution still makes its impact difficult to prove.

The law's reach extends past social apps to video platforms, online gaming, AI chatbots, and app stores, requiring companies to prove their products are safe by design.