After publication of the first few NSA documents via Snowden, people searched Linked In for keywords like XKeyscore. And found users who had cited them in work history. Security by obscurity?
They should add another layer of security by using embarrassing code names like YummyDookieChomper and IBeatMyWife, to discourage people from using them in their resumes or casual conversations.
Well, until Snowden's dump, stuff like XKeyscore must have seemed enigmatic enough. I mean, I doubt that people disclosed that they'd worked or consulted with the NSA, or NSA contractors. So only people who had would have known what those acronyms / code words meant. Rather like a secret handshake or whatever.