Third-Party Cookies

What are Third-Party Cookies?

Third-party cookies are small data files placed on your web browser by a domain other than the website you are currently visiting. Unlike First-Party Cookies which are set by the site you’re on to remember things like login sessions or shopping cart contents, third-party cookies are primarily used for cross-site tracking, targeted advertising, and conversion attribution.

Imagine you visit a tech blog, and an ad for a new smart thermostat from ‘EcoGadgets’ (a hypothetical AISearch Marketing client) appears. Even if you don’t click the ad, a third-party cookie might be set by the ad network (e.g., Google Ads). Later, when you visit a different website, that same ad network can recognize you via its cookie and show you more EcoGadgets ads, or track if you eventually make a purchase. This cross-site visibility has historically been the backbone of personalized digital marketing.

At AISearch Marketing, we’ve long understood the power of these cookies for our clients, but also the inherent privacy challenges they presented. Our approach has always been to leverage data responsibly, focusing on accurate measurement while anticipating shifts in the privacy landscape.

Why Third-Party Cookies Matter (and Why They’re Going Away)

Third-party cookies have been critically important because they enabled comprehensive cross-site user tracking. This allowed marketers to build detailed user profiles for highly targeted advertising and precise conversion attribution. They powered remarketing campaigns, where ads “followed” users who had shown interest in a product or service across different websites. For sales-led firms like the mortgage and lending brokers we serve, this meant we could often trace a lead’s journey from initial ad click to a booked discovery call, even if they bounced between sites.

However, the utility of third-party cookies is rapidly diminishing. Major browsers like Google Chrome are deprecating them, with a full phase-out anticipated by late 2024 (Google, 2023). This represents a monumental shift in digital advertising and measurement strategies. For our clients, particularly those in the NZ specialist financial services sector, this means the traditional methods of tracking lead generation and attributing sales are breaking down.

The impending “cookieless future” necessitates a pivot towards privacy-centric alternatives. Without effective new strategies, the ability to accurately attribute conversions and optimize ad spend across the customer journey will be severely hampered, making it challenging to demonstrate ROI. At AISearch Marketing, we’ve been proactively guiding our clients through this transition, ensuring their lead generation systems remain robust and measurable. For example, we’ve seen how crucial it is for our mortgage broker clients to maintain predictable lead flow, and the deprecation of third-party cookies directly impacts their ability to forecast.

Common Misconceptions About Third-Party Cookies

There are several widespread misunderstandings about third-party cookies:

• Misconception: Third-Party Cookies are essential for all website functionality.
  • Reality: Third-party cookies are primarily for cross-site tracking and advertising. Essential website functions like login sessions, remembering items in a shopping cart, or language preferences typically rely on First-Party Cookies, which are set by the website you are directly visiting and are generally considered less intrusive.
• Misconception: All cookies are bad for privacy.
  • Reality: While third-party cookies raise significant privacy concerns due to their cross-site tracking capabilities, first-party cookies are generally considered less intrusive. They are limited to the domain the user is visiting and often enhance user experience by remembering preferences for that specific site.
• Misconception: The deprecation of Third-Party Cookies means the end of all tracking.
  • Reality: It signals a shift from traditional cross-site tracking to more privacy-preserving methods. This includes server-side tracking, contextual advertising, and a greater reliance on first-party data. At AISearch Marketing, we emphasize that data collection isn’t ending, but evolving, and we help our clients adapt to these new, more compliant methods.

Third-Party Cookies in Practice (and the AISearch Marketing Solution)

Consider a scenario where AISearch Marketing is running an ad campaign for a client, ‘EcoGadgets,’ promoting their new smart thermostat. Historically, a third-party cookie placed by an ad network (e.g., Google Ads) would track a user who clicked an EcoGadgets ad on a tech blog. Even if the user didn’t purchase immediately but later visited a different review site, the third-party cookie would still recognize them. If they then completed the purchase on EcoGadgets’ website, the ad network could attribute that conversion back to the initial ad click. This allowed AISearch Marketing to optimize future campaigns based on this cross-site journey.

However, with the deprecation of third-party cookies, this traditional attribution model breaks down. AISearch Marketing now proactively implements alternative solutions for our clients. For instance, we help our clients set up Server-Side Tracking via a Conversion API (CAPI) or leverage Enhanced Conversions to send hashed first-party data directly to ad platforms.

This ensures that even without the cross-site tracking capabilities of third-party cookies, our clients can still accurately measure ad performance and attribute conversions. For example, by collecting first-party data like email addresses at the point of lead capture (e.g., a mortgage broker’s contact form) and securely hashing and sending it to Google Ads, AISearch Marketing can maintain a high level of conversion measurement accuracy. This allows our clients, like the NZ residential mortgage brokers we serve, to continue making data-driven decisions that directly impact their pipeline and settlements, even as the digital landscape changes.

Related Terms

• Cookies
• First-Party Cookies
• Cookieless Tracking
• Conversion API
• Server-Side Tracking
• Data Privacy