Well, they could gather that, then skim through your posts, and then look at all the other ways they’ve gathered your data, like any of the Facebook trackers on various other websites, then create a shadow profile of you with all of the collective sum information they have.

And that’s assuming you don’t already use Facebook or messenger, in which case they basically have everything anyway.

It also assumes that they haven’t purchased any data from data brokers to create these shadow profiles. Having an IP is actually pretty bad, all things considered, when you have a trove of information