[mattlondon]

I think that getting a list of all the data a company holds on you is allowed as part of the GDPR yes. In my experience of such things (and I have no direct experience of Facebook specifically), but often this is very, very dull.

You say "travel to Antartica" (i.e. something meaningful and interesting to a human), but the computer says "ID:2sb374k44nmdld7394m44na7a63bba73hha3" (i.e. something meaningful to a computer)

So instead of seeing a human-readable list of things you've looked at, you get a totally unintelligible list of primary keys that are used in some embedding-space in some algorithm somewhere that is used to pick the most salient ad to show you at that moment in time.

Like I said, I have no idea how Facebook does this but I would be amazed if there was anything human-readable about the profile they've built on you. Its just too high-maintenance (and frankly pointless) to have human-readable labels for everything.

[hiatus]

The data has a meaning to Facebook, whether it is stored in human-readable format or not. If there is a translation map or other data required to interpret your data, that should be included in a data export.

[mattlondon]

That is my point, there is likely no translation map. It's an ID for some data-point/vector/embedding used in an algorithm and likely has no meaningful human interpretation or translation.

It is not secret code for "looks at Antarctica travel pages", it is a computer generated value for some intersection of thousands/millions of variables.