[dale_glass]

Not nearly to the same level, and a lot of that is proprietary info. Facebook collects lots of data but doesn't like to share it.

[pnpnp]

Some of it is, but things like property ownership are completely open in some countries. I have a map overlay that lets me see ownership for parcels.

Granted you can have an LLC own property, but that's a different obfuscation mechanism.