http://www.theatlanticwire.com/politics/2013/07/nsa-admits-it-analyzes-more-peoples-data-previously-revealed/67287/
Let's say the average person knows 100 people.
So NSA will track that person's contacts. ie 100 people.
The contacts' contacts. ie another 100 x 100 = 10,000 people.
And their contacts. ie 10,000 x 100 = 1,000,000 people.
So one suspect yields a potential search of 1,010,101 people, assuming no crossover contacts.
ie the NSA doesn't need many suspects to access information for the whole population.
It is what Snowden says it is. That whistle needed blowing.