The whole recent xkeyscore thing made me remember the random keyword-spamming during the Echelon craze.
The reason I made it is that awkward gut feeling you get if you ever used the word "bomb" or something in a sentence, and you're not sure if that will flag something so someone will monitor more of your conversation/traffic. There should never be a reason to have to think like that.
All sites and links are indexed automatically, and the search strings are generated randomly, based on a few sets of rules, and on text of the pages it finds.