They've been doing this since after 9/11, and it's perfectly legal. I'm not defending anyone, but stop listening to people like this psycho on NBC.
The Feds have been tracking everything since 9/11. But only certain words trigger any tracking. If you text/write "bomb", or anything relating to "terror", then the gov't computer in that room will flag it, and review it electronically for any connections to other instances where that IP or phone number experienced similar trigger events. In fact, words in this message will trigger the entire thread. So I just flagged us for Gov't review by using the word "bomb" and the word "Government", and maybe the word "President". Oh now, look out. They're watching now.
Believe it or not, the feds will not knock your door down for MJ. It will most likely be the state authorities if you are in a illegal state. Don't go to Florida. They have the some of the strictest criminal policies for Mj in the world. Caught with 1 oz or more and you can easily get 20 years in prison. If you live in FLA, you should definittely not be here.