from totally nonsense Data NSA can generate very usefull information e.g. who you (probably) will vote for?
not that it would really matter who you vote for with presidents beeing like the train-comander „go faster“ or „go slower“ on tracks others layed.
We also combine this data among our services and across your devices for these purposes. For example, we show you ads based on information about your interests, which we can derive from your use of Search and Gmail, and we use data from trillions of search queries to build spell-correction models that we use across all of our services.