FBI considers your retweets to be endorsements. Could land you in jail
techcrunch.com
techcrunch.com
Of course they will use tweets, retweets, and other signals as data that help inform them about a person of interest. Why is this surprising? This person was not arrested for a retweet which is what the headline implies. They were arrested for showing support for ISIL in a number of ways and contacting people to arrange or trying to arrange to join them.
I'm no huge fan of the NSA itself or many government practices that I feel are an overreach, but this isn't one of them.