Twitter fesses up to more adtech leaks
Twitter has disclosed more bugs related to how it uses personal data for ad targeting that means it may have shared users data with advertising partners even when a user had expressly told it not to.
In a blog post on its Help Center about the latest “issues” Twitter says it “recently” found, it admits to finding two problems with users’ ad settings choices that mean they “may not have worked as intended”.
It claims both problems were fixed on August 5. Though it does not specify when it realized it was processing user data without their consent.
The first bug relates to tracking ad conversions. This meant that if a Twitter user clicked or viewed an ad for a mobile application on the platform and subsequently interacted with the mobile app Twitter says it “may have shared certain data (e.g., country code; if you engaged with the ad and when; information about the ad, etc)” with its ad measurement and advertising partners — regardless of whether the user had agreed their personal data could be shared in this way.
It suggests this leak of data has been happening since May 2018 — which is also the day when Europe’s updated privacy framework, GDPR, came into force. The regulation mandates disclosure of data breaches (which explains why you’re hearing about all these issues from Twitter) — and means that quite a lot is riding on how “recently” Twitter found these latest bugs. Because GDPR also includes a supersized regime of fines for confirmed data protection violations.
Though it remains to be seen whether Twitter’s now repeatedly leaky adtech will attract regulatory attention…
Twitter specifies that it does not share users’ names, Twitter handles, email or phone number with ad partners. However it does share a user’s mobile device identifier, which GDPR treats as personal data as it acts as a unique identifier. Using this identifier, Twitter and Twitter’s ad partners can work together to link a device identifier to other pieces of identity-linked personal data they collectively hold on the same user to track their use of the wider Internet, thereby allowing user profiling and creepy ad targeting to take place in the background.
The second issue Twitter discloses in the blog post also relates to tracking users’ wider web browsing to serve them targeted ads.
Here Twitter admits that, since September 2018, it may have served targeted ads that used inferences made about the user’s interests based on tracking their wider use of the Internet — even when the user had not given permission to be tracked.
This sounds like another breach of GDPR, given that in cases where the user did not consent to being tracked for ad targeting Twitter would lack a legal basis for processing their personal data. But it’s saying it processed it anyway — albeit, it claims accidentally.
This type of creepy ad targeting — based on so-called ‘inferences’ — is made possible because Twitter associates the devices you use (including mobile and browsers) when you’re logged in to its service with your Twitter account, and then receives information linked to these same device identifiers (IP addresses and potentially browser fingerprinting) back from its ad partners, likely gathered via tracking cookies (including Twitter’s own social plug-ins) which are larded all over the mainstream Internet for the purpose of tracking what you look at online.
These third party ad cookies link individuals’ browsing data (which gets turned into inferred interests) with unique device/browser identifiers (linked to individuals) to enable the adtech industry (platforms, data brokers, ad exchanges and so on) to track web users across the web and serve them “relevant” (aka creepy) ads.