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Social media is the easiest target.
Essentially, the Government employs interns to write Python scripts that mine and collect social media data. Read Violent Python to learn more about the actual techniques, join a Government organization to actually perform said techniques.
You should be more worried about your browsing history and emails being monitored, stored, and mined to create an evolving profile on you. All of this individual data is aggregated and used to uniquely identify you, your history, connections, beliefs, preferences, purchasing habits, and so on.