so this local mess thing is a pretty huge deal.
also, if youve ever wondered "how the fuck does instagram know this shit, are they listening to me?!"
well.. yes, they are (https://futurism.com/the-byte/facebook-partner-phones-listening-microphone)
but they, until the 3rd of this month, were playing hot potato with their tracking pixels that live on millions of sites, your browser, and fb/ig apps on your phone
https://localmess.github.io/
[edit] oops, had the wrong link for localmess writeup