Years ago, I submitted an admittedly half-baked version of this to YC. The concept is interesting, but the implementation options are:

a) require considerable and routine manual data entry from the end-user

b) suck up every bit of data from e.g. email, phone, messaging apps, banks and end up with some privacy/security disaster

Anyway, there are all sorts of things you could do with that data, like trawling for novel links in your social graph.