If you are on the internet, use a cell phone, have a GPS unit, use a credit card, been arrested, been born in a hospital, or have a social security number, not only the United States government but damned near anyone else on the planet can find more information about you than you know about yourself.
In the link below, there is a list of hundreds of words the U.S. Homeland Security monitors in internet messages and in blogs. I've used a couple dozen of these words myself and plan to use more in the future.
Maybe this is why every time I travel by plane, my suitcase gets checked either coming or going. As I suggested earlier in this post, the presumption of privacy for individuals doesn't exist in the modern world.