Google has a lot of data on a lot of people, and as such, often they're the obvious single target. But, it's useful to keep in mind that the aggregation of all

Google has a lot of data on a lot of people, and as such, often they're the obvious single target. But, it's useful to keep in mind that the aggregation of all data on a person, across all sources, is several orders of magnitude greater than what Google has. And, very recently, that larger set has been merged together.