Privacy on the Web

Dated Jan 4, 2021; last modified on Mon, 18 Jul 2022

One can use curl -v <url> to see all of the redirections and cookies set. found that generating a tiny URL for Zoom links gives a URL that first goes to

I tried this on, which points to, but didn’t observe any 3rd party cookies. did set a cookie, but that’s probably expected.

proposes Federated Learning of Cohorts, which aims to enable ad-targeting based on people’s general browsing interest without exposing the exact browsing history.

Stripping tracking parameters in URLs, e.g. Facebook’s fbclid=, has been implemented in Firefox 102 .

A top comment in , where FB changed URLs from to claims that the new FB URLs circumvent features like Firefox’s stripping of tracking URLs. I don’t follow; the URL is served by, and thus no need for 3P tracking parameters.

I usually “trust” HN’s top comments, but in this instance, the top comment seems unfounded. Cue in Gell-Mann’s amnesia .

  1. URL shorteners set ad tracking cookies. Luke Miles. . . Jan 2, 2021.
  2. Federated Learning of Cohorts. Xiao, Yao; Karlin, Josh. . . Mar 3, 2021. Accessed Mar 14, 2021.
  3. Ask HN: What is with the new URLs on | Hacker News. . Jul 16, 2022. Accessed Jul 16, 2022.
  4. New Firefox privacy feature strips URLs of tracking parameters. Lawrence Abrams. . . Jun 28, 2022. Accessed Jul 16, 2022.