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A high-performing ad can be tempting to copy. But a seller needs to know what the ad actually showed, who it was for, and what the brand wanted viewers to do. A thrift bundle and a piece of jewelry do not need the same kind of proof. Start with the buyer's question, then choose a creative approach that answers it.
Two useful TikTok advertising examples come from Goodfair and CREA Jewelry. TikTok describes Goodfair promoting employee-made organic posts and CREA testing Spark Ads against in-feed ads. Their reported results are specific to those campaigns. Use the cases to choose a creative question for your own test, not to predict your return.
Goodfair sells bundles of pre-owned clothing where each item is a surprise. For a shopper who cannot pick every piece in advance, the obvious question is what receiving a bundle might feel like. A video can show a person, a process, or a piece of the product experience that a short product title cannot convey on its own.
In TikTok's Goodfair case study, the platform says the brand used posts made by employees for its organic profile and promoted them with Spark Ads. The report describes a mix of warehouse content and educational videos about fast fashion. It also says the brand engaged with questions in comments. These are the activities described in the case, not a claim that we watched or tested every ad in the campaign.
The creative choice is worth separating from the headline numbers. Employee-made content gave the brand material connected to how it operated. The Spark Ad format allowed existing organic posts to be used in paid placement. Those two choices are related, but they are not identical: making a post and getting permission and access to use a post in advertising are separate parts of the job.
TikTok reports that Goodfair's cost per acquisition fell by 50.7% in the case, and separately compares some other metrics with the account average. The case does not establish that an employee-made video will cause the same result for another store. It also does not give you the private costs, audience conditions, or full creative history needed to recreate the campaign.
For a different product, the useful question might be: what part of the experience is hard to understand from the listing? A seller of a storage item could show how it opens or fits into a space. That is a hypothetical idea, not a Goodfair ad. The point is to make the buyer's question visible before deciding whether the video deserves a paid test.
TikTok's CREA Jewelry case study describes a Japanese jewelry retailer that wanted to turn engagement on its videos into business results. The brand selected videos with high views and engagement and tested Spark Ads against regular in-feed ads. The report describes a two-week comparison and a website conversion goal.
According to TikTok, the Spark Ad campaign had a 44% better conversion rate and 26.4% lower cost per acquisition than the in-feed campaign in that comparison. Those are the platform's case-specific reported results, not benchmarks for your account. The page describes several campaign choices, so the comparison does not isolate a single cause for the difference.
CREA's example offers a different planning lesson from Goodfair. Rather than treating a liked video as proof that an ad will sell, the team compared an approach with another campaign format. A store considering its own test still needs to decide what it will compare, how the settings differ, and which event matters for its business.
Before promoting an existing post, confirm that you have the right to use the content for the proposed placement and period. If a creator made it, discuss the intended paid use with that person. A public post is not by itself a full agreement to run it in advertising. Also review the platform's current steps for the ad format you plan to use.
| Case | Choice reported by TikTok | Question a seller can ask | What remains unknown |
|---|---|---|---|
| Goodfair | Promoted employee-made organic posts with Spark Ads; the report describes warehouse and educational content. | What part of the product experience can we show clearly? | Whether the same content or results would work for another business. |
| CREA Jewelry | Selected well-engaged videos and compared Spark Ads with in-feed ads over a reported two-week test. | What format or creative choice should our test compare? | Which single factor caused the reported difference, or what our account will achieve. |
Sources: TikTok on Goodfair and TikTok on CREA Jewelry, accessed November 3, 2026. Each report describes its own campaign and conditions.
Both cases describe a link between content and a paid placement, but they start with different business questions. Goodfair's report emphasizes a brand with an existing organic community and distinctive product experience. CREA's report describes a comparison between ad formats. A smaller seller should not assume it has the same audience, budget, creative assets, or account history as either brand.
There is also a difference between a video being visible in a search tool and proof that it ran as an ad. A public video can provide a creative example, but a search result alone may not tell you whether it was promoted, what targeting was used, or what it achieved after paid distribution. For the cases above, the paid campaign claim comes from TikTok's own reports.
Start with one product and one question. A seller of a reusable lunch container might ask whether buyers understand how the lid closes. A short demonstration can show the action; a testimonial might answer a different question about a person's experience. Both could be useful, but they should not be treated as the same test.
Write down the action the viewer needs to see. For the container, that could be the lid being opened and closed in a normal setting. Then state the placement and what you want the viewer to do next. If the team wants to compare two openings, keep a record of what changed in each version. If the landing page or audience changes at the same time, interpret any difference with that context in mind.
Choose a measure that fits the question. A view can tell you something different from a visit or a purchase. Check that the event is available and measured in your own setup before spending. A result with too little context may be a prompt for a follow-up test rather than a firm answer about why people acted.
Use a brief such as: “Product: lunch container. Buyer question: how does the lid close? Show: one clear close-up of the action. Test: compare two openings while noting any other setting changes. Measure: the event selected before launch.” This is an invented planning example, not a campaign result or a suggested performance target.
If the brief feels broad, choose what one paid test should prove. You can also identify the missing proof in a creative before making more versions. Those decisions come before a meaningful comparison of results.
After the test, compare what happened with the question you wrote down. Did viewers reach the event you intended to observe? Was the product action clear in the version that ran? Check the actual delivery dates and any changes to the audience, page, budget, or creative. If several things changed together, the result may not tell you which change mattered.
Keep the original brief, versions, and settings with your notes. That makes the next decision easier: repeat a useful comparison, improve the part viewers could not see, or stop if the question was not answered. A public case can suggest where to look; your own records tell you what happened in your own test.
When an established ad weakens, investigate creative fatigue before assuming the video is the only cause.
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