809
How to delete Facebook, Instagram, and Threads | TechCrunch
(techcrunch.com)
This is a most excellent place for technology news and articles.
Unfortunately, unscrupulous companies can build shadow profiles that bypass cookie and storage based isolation techniques like this.
Your browser gives off a lot of information. See here for some of the information they can use: https://amiunique.org
You're best off blocking things with uBlock Origin vs something that just isolates.