Who has more data about you than Facebook, Google or Amazon?

It is a decent pub question. Who holds more data about you than the large platforms?

The answer is you. It always has been. You hold the health records, the bank history, the photos, the correspondence, the documents, the years of work product. Any single platform sees a slice.

The answer was also, for twenty years, completely useless.

Why holding it never helped

Three reasons, and they were all real.

• It was scattered. Forty services, forty formats, no way to hold them together.
• It was unreadable. A CSV export of your own history is not knowledge. It is a file.
• There was nothing to do with it. The tools that could extract value from large messy personal corpora belonged to the companies that already had their own.

So the fact that you held the largest share of data about yourself was a technicality. Platforms held less and got all the value, because they had the ability to use what they had.

What changed

The third constraint broke. The capability to read a large, messy, unstructured personal corpus and answer questions from it is now widely available. It no longer requires a data science team.

That flips the calculus. The reason to assemble your own material was previously theoretical. Now assembling it produces something that works: a system that can answer from your entire body of work rather than from whichever fragment a platform happened to capture.

The asset is knowledge, not exhaust

There is a distinction worth being precise about. Platforms collect exhaust: what you clicked, where you were, what you bought. It is valuable in aggregate and nearly worthless per person.

What you hold is different in kind. It is intentional output: the things you wrote, decided, documented and taught. It is worthless in aggregate, because it is specific to you, and highly valuable per person, for the same reason.

Nobody was ever going to build a business on your exhaust except at enormous scale. You can build something useful on your knowledge at a scale of one.

The catch

Assembling your material into a system is exactly the moment the ownership question becomes urgent. You are concentrating the most valuable thing you have into one place.

If that place claims rights over it, you have just done the platforms' work for them, more efficiently than they ever managed. If it does not, you have built the first thing that ever made holding your own data actually pay.

That is the whole design brief. Not collect more, but concentrate carefully, under terms that leave the asset yours.

This piece revisits an earlier essay from our Medium archive: Who has more data on you than Facebook, Google or Amazon? (https://medium.com/prifina/who-has-more-data-on-you-than-facebook-google-or-amazon-ee46e4db7104).