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That's not the only issue. The ids are then fed back into the facebook. Facebook can use it to link contacts together. I get a share link, it gives it an ID, I
by rplnt 5y ago
That's not the only issue. The ids are then fed back into the facebook.
Facebook can use it to link contacts together. I get a share link, it gives it an ID, I send it to someone, they open it and now they have linked my account with their account.
Same works if I click on a page and get the ID, share just that page, and someone clicks it (and there's some fb element on the page).
Now if several users a day share a link here on HN, facebook will know about us as belonging to a certain group.
- lmkg 5y agoThe GP mentioned UTMs specifically, which are coarse-grained. Generally all links in a campaign will share the same UTM parameters. Sometimes different sizes or A/B variants will have distinguishing values. But as a matter of course, these are not unique to the user. Their primary purpose is to aggregate data, not to distinguish it. This is different than the type of tracking you're talking about. ID-type parameters like gclid, dclid, and fbclid are all unique to the ad impression, and tied to the individual that ad was served to. Which means they can tie it back to other data sources they have about the individual. Like social graph data for Facebook, or demographic or interests data for other advertiser networks. Personally I care about ID parameters a lot, and UTM-type parameters not at all. But that's just me.