Are you a Linux Journal reader or use software such as Tor and Tails Linux? If so, you've probably been flagged as an "extremist" by the NSA. Leaked documents related to the XKeyscore snooping program reveal that the agency is targeting anyone who is interested in online privacy, specifically those who use the aforementioned software and visit the Linux user community website.
The program marks and tracks the IP addresses of those who search for 'tails' or 'Amnesiac Incognito Live System' along with 'linux', ' USB ',' CD ', 'secure desktop', ' IRC ', 'truecrypt' or ' tor '. It also refers to the Tails Linux distribution as "a comsec mechanism advocated by extremists on extremist forums".
Very old news (this article is from 2014), and doesn't apply to the US.
Edit: I'm talking about the "extremist" label. I know the US spies on us too.