Marketers can use data for audience targeting only when its source, purpose, audience, and use meet the rules that apply in the places and channels involved. First-party data is not automatically permissible, and contextual advertising is not automatically anonymous. A more privacy-conscious starting point is to use the minimum information needed for a clearly explained purpose, honor people’s choices and objections, and avoid sensitive or highly precise targeting unless the requirements are clear.
Start with the purpose, not the data you have
There is no universal list of data that marketers may use without invading privacy. The answer depends on where the marketer and audience are located, what information is involved, how it was obtained, the intended use, the channel, and the roles of any advertising partners or platforms.
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The European Commission’s GDPR overview describes a useful baseline: processing should be lawful and transparent, tied to specific purposes disclosed when data is collected, and limited to what is necessary for those purposes. In practical terms, define the campaign objective first, then decide which information is genuinely needed to meet it. Collecting extra details “in case they are useful later” makes the privacy case harder to justify.
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| Approach | What it uses | Privacy consideration |
|---|---|---|
| Contextual targeting | The content of a page someone is viewing or a query they made | Can select an ad from context rather than a persistent personal profile, but the ad-delivery system may still process identifiers or other personal information. |
| First-party audience targeting | Information collected through a direct interaction with the advertiser, such as on its site, app, or in a store | A direct relationship does not itself establish permission for every later use. Purpose, notice, legal basis, choices, and sensitive-data restrictions still matter. |
| Partner-supplied or purchased lists | Contact details or audience records collected by another organization | The marketer needs to establish that the data was lawfully collected and may be used for the intended advertising purpose, not rely only on a vendor’s assurance. |
| Cross-site retargeting | Information about a person’s activity across websites or services | Can create a more persistent behavioral profile and merits heightened scrutiny of transparency, choice, tracking, platform policy, and local rules. |
| Sensitive, precise-location, or children’s data | Information such as health or financial details, precise whereabouts, or children’s personal information | These are high-risk categories. Requirements may be stricter, and some targeting practices may be inappropriate or restricted. |
When first-party data may be useful
“First-party” describes how a business obtained information, not whether every use is allowed. A customer email address, site visit, app interaction, or store purchase may have been collected directly, yet using it for a new advertising purpose can still raise questions about notice, expectations, legal basis, retention, and the person’s choices.
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Google Ads policy defines first-party data as information collected from customers, site visitors, and app users through interactions with an advertiser’s products and services, including its sites, apps, and physical stores. Google permits using such data to create audiences for targeting, subject to its policy conditions, including restrictions around sensitive interests. That is a platform rule; it does not replace the legal requirements that apply to the advertiser.
Why contextual targeting can reduce profiling
Contextual targeting selects an ad based on the page being viewed or a search query, rather than relying on a profile assembled from a person’s activity across different contexts. FTC staff’s 2009 discussion of online behavioral advertising described contextual ads as involving little or no data storage and noted that contextual and first-party advertising may raise fewer privacy concerns than other behavioral advertising.
That discussion is historical, not a guarantee about every current ad system. A contextual campaign may still involve identifiers or other personal information in the delivery or measurement process, so marketers should check what their actual vendors and tools process. Contextual selection is a way to reduce reliance on personal profiling, not a blanket exemption from privacy rules.
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What to check before using a third-party list
The European Commission says an organization acquiring a contact list or database from another organization must be able to demonstrate that the information was lawfully collected and that it can be used for advertising. If consent is the basis, the consent should cover transmission to other recipients for their own direct marketing. The acquiring organization also has responsibilities relating to notice, accurate and up-to-date information, direct-marketing objections, and channel-specific requirements.
- Ask for the source and collection circumstances for the specific records, not just a general claim that the list is “permission-based.”
- Confirm that the permission or other legal basis covers your organization, intended purpose, audience, and channel.
- Establish how people will be informed and how objections or opt-outs will be honored.
- Check whether the list is current and whether any records must be removed before activation.
- Review the rules for the relevant channel; for example, email marketing may also involve ePrivacy requirements in applicable jurisdictions.
Apply extra scrutiny to location, sensitive information, and children
A 2024 Treasury Board of Canada Secretariat notice recommends privacy-protective practices for digital advertising by Canadian federal institutions. It advises limiting personal information, using aggregated or de-identified information where possible, avoiding precise neighborhood or small-radius geotargeting and cross-website retargeting, obtaining meaningful consent before using personal information, avoiding sensitive information such as financial, biometric, or health data, and not intentionally targeting or tracking children. This notice applies to federal institutions, not all advertisers; its practices are useful examples of risk reduction rather than universal legal rules.
Children’s data can trigger specific obligations. In a January 2025 announcement of finalized amendments to the U.S. Children’s Online Privacy Protection Rule, the FTC said operators of covered child-directed services must obtain separate verifiable parental consent before disclosing children’s personal information to third parties for targeted advertising. The announcement also describes retention limits tied to the specific purpose. Applicability, effective dates, and current implementing requirements should be checked for the service and campaign at issue.
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Rules and proposals are not interchangeable
Legal duties vary by jurisdiction and channel; GDPR, U.S. children’s privacy rules, Canadian federal guidance, UK privacy rules, and a platform’s own policies are not substitutes for one another. A platform’s technical ability to accept an audience is not proof that the advertiser has legal permission to use it.
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For example, in a 7 July 2025 announcement, the UK Information Commissioner’s Office described a proposed enforcement approach exploring privacy-preserving advertising to users who have not consented where risks are demonstrably low. The ICO also said it would continue enforcing consent requirements for collecting personal information for targeted advertising. This was a proposal, not blanket approval for non-consensual targeting.
Quick Recap
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A practical pre-campaign review
- Define the objective. Write down what the campaign is meant to accomplish and what audience attribute is actually necessary to do it.
- Map the data. Record what information will be used, where it came from, who collected it, whether it identifies or can be linked to a person, and which vendors or platforms receive it.
- Check purpose and permission. Confirm that the purpose was explained and that the applicable legal basis, consent, or other required choice covers the planned use, audience, and channel.
- Reduce exposure. Remove unnecessary fields, narrow geographic precision, avoid sensitive traits where possible, and consider contextual or aggregated approaches if they can meet the objective.
- Set boundaries. Establish access limits, retention periods tied to the purpose, audience exclusions, and a process for handling objections or opt-outs.
- Verify platform and vendor terms. Check current advertising policies, data-use restrictions, and each provider’s role rather than treating platform approval as legal clearance.
- Keep a record. Document the source, purpose, permissions, notices, exclusions, retention plan, and policy checks so the campaign can be reviewed and corrected.
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