Meta's 7-Day Click Window Will Claim Black Friday Sales

Meta's default attribution setting is 7-day click and 1-day view. Under it, a purchase on Friday 27 November is credited to any Meta ad clicked from Friday 20 November onward, and to any Meta ad viewed on Thursday 26 November. Your Black Friday sales, in Meta's report, begin a week before Black Friday.

That is not a bug and it is not hidden. It is the attribution window, and everyone in the account has agreed to it by never changing it. The curiosity worth indulging is a specific one: how many of the orders Meta will report for Cyber Week 2026 were touched by an ad before Cyber Week started?

The window, and what peak does to it

In a quiet month, a 7-day click window mostly credits purchases to the ad that sent the buyer. In Cyber Week the population changes. Your prospecting spend in mid-November is deliberately reaching people who intend to wait for the discount. They click on the 19th or 20th, they buy on the 27th, and the click is inside the window. The report is correct under its own rule. It is also silent on whether the same person would have bought on the 27th from the email, the organic search, or the bookmark they made in October.

The Price of Being Found describes the three-systems problem as a category error, not a reconciliation problem: the platform reports conversions it can associate with exposure to its own inventory, inside a window it defines. The commerce platform reports orders. The question a budget needs answered, what would have happened without the spend, is a counterfactual, and no window produces one.

The definition changed in March 2026, so year-on-year comparisons already do not hold

For years Meta's own published definition of a click included interactions such as likes, shares and saves. According to the book's account, on 3 March 2026 Meta narrowed click-through attribution for website and in-store conversions to link clicks only, with other interactions moved to a separately named category. The book notes it relied on a dated practitioner source quoting the announcement rather than the page itself, and labels that footing as weaker than the rest of its chapter. Take it at that weight.

If the account's reported conversions fell after March with no change in performance, this is the likely reason, and it also means Cyber Week 2026 against Cyber Week 2025 will compare two different quantities unless someone restates last year under the new definition. Nothing in the dashboard will say so.

The number to put beside Meta's

Add up every platform's claimed conversions for Cyber Week, without deduplication, and divide by the orders your store shipped. The book calls it the claim ratio, and it is the fastest way to size how much of Meta's Black Friday belongs to Meta alone. Your Black Friday ad budget is finite. The platforms' claims are not. covers the allocation consequence.

Then, if the channel qualifies against the measurability floor, run the one test that answers the counterfactual question: a geographic holdout with its pre-period fixed and its minimum detectable effect written down before launch. The last start date for the standard design is 2 October.

Rightful heritage

Octalysis names a loss-avoidance mechanic Rightful Heritage: the feeling that something already yours is being taken. Your Black Friday orders are yours. Meta's report reassigns a share of them to a click from the week before, under a rule you can change in Ads Manager's attribution settings but have not. Changing the setting does not change what happened. It changes what is claimed, which is worth knowing before the claims become next year's budget.

What to do this week

• If you have to defend the number: pull Cyber Week 2025 under 7-day click and under 1-day click, side by side, and note the gap. That gap is the size of the "touched earlier" population last year.
• If you own the budget: ask for the claim ratio for last Cyber Week before any ROAS figure reaches the plan.

The Black Friday 2026 calendar has the dates. A causal read on your GA4 export reports per-channel incremental ROAS with intervals, which is the figure the window cannot give you.

Attribution settings as of 9 September 2026. The March 2026 definition change is reported by The Price of Being Found (Edition 2.10), Chapter 9, with the caveat stated above.