You are concerned that the NSA is aggregating data and spying on you? If you check, or look at a picture of the NSA (Why does an office building need a radar dome on the roof?), you will see that has always been their job. But while you are worrying about that, you are telling scores of commercial data aggregators everything about yourself, just by what you search for on Google, what you like on Facebook and where you access the internet from. Your sex, your race, your sexual orientation, your income, your politics, your IQ (from the type of French fries you like), it's all an open book.
This book is the story from one involved nerd, along with some nice graphics.
People's activities are somewhat limited, so the use of this data is mostly to target you for repression or elimination in a repressive society, to sell you something in a capitalist society, or for law enforcement to find you. So if you're only getting targeted Amazon ads, be happy.
Of course, I can only imagine what the data will be used for after Skynet becomes active.