TikTok Shop and the Algorithm Doing the Selling

This piece was originally published in August 2025. It's been updated to reflect the John Lewis TikTok Shop pilot announced in March 2026 and the shift in the US regulatory situation.

John Lewis launched a 90-day TikTok Shop pilot in March. John Lewis. The full-price department store, the trusted brand, the "never knowingly undersold" strapline that ran for 96 years: trying out impulse-purchase social commerce.

I don't say that to mock them. I say it because the signal value is high. When John Lewis thinks it needs to be on TikTok Shop, the platform's commercial weight is no longer something mid-market and smaller retailers can reasonably ignore.

eMarketer estimates TikTok Shop now commands 18.2% of total US social commerce, nearly a fifth of the market since its US launch in late 2023. Total US sales are forecast to surpass $23 billion in 2026. In the UK specifically, 42% of shoppers say they'd consider buying through social platforms, and among 18–34s that figure rises to 89%.

The Algorithm Is the Product

What makes TikTok Shop different from a social shopping add-on is the algorithm. This sounds like a truism ("the algorithm" is the explanation for everything on the platform), but it's specifically true for commerce in a way that deserves unpacking.

TikTok's recommendation system is unusually good at surfacing content that converts. It learns not just what you engage with but what you buy after engaging, and it builds a picture of purchase intent signals that is, by most accounts, more commercially sophisticated than what Instagram or Facebook's equivalents can do. The result is that products get shown to the people most likely to buy them, with far less explicit targeting work from the brand or retailer.

This year TikTok introduced Smart+ Ads, an AI-powered campaign type that automates creative selection, bidding, and targeting. You provide a budget and a product feed; the platform optimises for outcomes. For brands without the resource to manage sophisticated paid social campaigns, this significantly lowers the operational floor for running effective commerce on the platform.

The Insight Spotlight tool goes alongside this: it surfaces trending content and keywords in real time, so brands can align their organic content to what's already working on the platform. The AI layer is doing the market research that a well-resourced social team would previously have done manually.

The Structural Concern

The thing I keep thinking about with TikTok Shop isn't the growth numbers. It's the structure.

A retailer selling through TikTok Shop is, in a specific sense, renting shelf space in someone else's store where the landlord controls the foot traffic, the discovery algorithm, the customer relationship data, and the transaction. For the brand or retailer whose product gets purchased, the question of whether that customer is now "their" customer (and what data they have to build that relationship further) has a complicated answer.

This is the same tension that exists with Amazon, with Google Shopping, and increasingly with any AI-mediated commerce channel. The more efficient the algorithm is at matching buyers to products, the more the algorithm owns the discovery relationship and the less the brand does.

For categories where impulse purchase and price drive behaviour (beauty, accessories, homewares), TikTok Shop is probably a channel you need to be on. For categories where brand relationship and customer lifetime value are the core metrics, the trade-offs deserve more thought.

The Regulatory Overhang

TikTok's corporate structure and its relationship with ByteDance in China created persistent regulatory uncertainty in Western markets throughout 2024 and into 2025. In the US, that debate has now substantially resolved: a memorandum of sale was signed in December 2025, with TikTok's US operations moving to a consortium of investors including Oracle and Silver Lake, the deal closing in January 2026. Whether that fully removes the structural concern for US advertisers and retailers is a separate question, but the acute "ban or divest" moment has passed.

In the UK and EU, the situation is more live. The Digital Services Act has created additional obligations for very large platforms, and the European Commission found TikTok in breach of its transparency rules in late 2025, a non-compliance finding that could carry a fine of up to 6% of global annual turnover. The UK's Online Safety Act applies similar scrutiny.

None of this has materially disrupted TikTok Shop's growth so far. Whether the regulatory situation shifts further is worth keeping an eye on if you're making significant investment decisions in the platform.

The John Lewis pilot has probably answered its own question by now. I'd be curious to know what the data showed.