Data has combinatorial power.

When you mash up two disparate sources of data you get more potential than in either data source alone.

This is also true for our own personal data.

One reason we don't regularly experience this combinatorial power is because in a vertical, app-based world it's not possible.

And the small number of aggregator apps that do have enough of our data are unable to build niche software due to the tyranny of the marginal user.