NSA have all the info, everyone's pictures, everyone's tweets, emails, private messages and smartband logs.
NSA also have an easy to use user interface, that let's you bring up any data from anywhere in the planet. Like the voice logs of telephone calls are searchable by keywords (so they will start tracking you based on nefarious activity codeword triggers, "NSA" is probably such a trigger), and the gps data is co-related onto a map that automatically picks out suspicious activities, and even tags them according to probability... the whole spectrum of offenses from petty trespassing to adultery to drug dealing and terrorism. Not saying the local police cannot do this, or the phone company can make a deal with the police (money goes to US obviously) but the NSA is particularly interested in saving geotagged and versioned gibberish from all around the world, not just their own country. So if you take a picture of a cat under a car in Ouagadougou, NSA knows seconds later, or as soon as you go to a wi-fi area, or in a particular 30 minute window, or the picture slowly appears on their screens pixel by pixel over the course of the day (we dont know which yet). Later, when your friend saves the picture of the cat from your dp because it looks cute, the NSA servers get that too as soon as your friend goes to a wi-fi area, or the same 30 minute window, or you know, the same picture in square format appears pixel by pixel on a screen next to the one streaming your pics over the course of days.
plus, because they can do all this, they also must be better at tagging and organizing all your data bettar than yourself. So not only do they have a central database of all files every made in every format and every bitrate, they also have it with the local meta data and songs.pk tags and each illegal version of the file as well, coz they have well, everything. your own photos that you have kept in my documents> new folder > new folder > new folder (2), NSA keeps tagged according to date, time, context, and content, available for use by business minded consulting companies that are fronts for some kind of financial tomfoolery or other... I suppose.
Oh, plus they have all the nude selfies ever taken.
Now considering they have servers for all of this, and electricity for the servers. The secret to NSA is that they have figured out what to do with all the data. Like ALL of it.
please consider the difference between collecting such data (say turning on the microphone and recording speech or keystrokes) (wait a minute, is NSA like Lucious Fox?) form everyone and from one targeted individual. If they are taking data of everyone, there is security in that itself.