[gridland]

I work in advertising. The death of cookies is a huge annoyance to the industry. you are 100% correct that gclid or fbclid are just a means to store "the cookie" in plain text in the url string. All the big programmatic media platforms do it too now (The Trade Desk, Yahoo, etc).

[jsemrau]

Advertising will change significantly in the years to come. All of this surveillance is not useful for both sides. I think we have reached a point where we can use better social networks and more fun concepts to connect with one another. Hint: I work at finclout.io

[MichaelMoser123]

not useful? The ability to push targeted advertisements based on this surveillance is what is differentiating internet media from TV; actually cable TV is in steady decline, because they don't have this feature.

[MichaelMoser123]

thanks! I don't know much about the advertising industry, I just thought about the following question: if some site is hosting a pop-up advertisement, then the javascript on that advertisement can get the referrer header by means of its own javascript code. Now my question is: do the different advertising networks share that data between one another? I guess that it might be a big business, if yahoo ads would trade the obtained glcid parameter values with google, or vise versa.