Sounds about right, but the benefit is that reading through every single person's personal index would be very fast. This can be useful in many ways, and it alo

Sounds about right, but the benefit is that reading through every single person's personal index would be very fast. This can be useful in many ways, and it alone was probably the goal. In fact it was probably already developed long before this feature was deployed to the general populace, and this new feature is just a token gesture of "giving back to users." I doubt it'll see much use from end-users themselves. Yes the search terms from users will be useful, but I don't see this as being a replacement for Google.