I don't use Facebook/Twitter/Instagram/etc, but ordinary people seldom believe it ("come on, you are a programmer, how come you don't use web?!") and often assume I don't want to share my profile with them. I'm afraid the gov agencies will take the same approach and automatically assume the absence of the social media as an attempt to hide something. Luckily in this case, though, I hope not to have to visit USA anytime soon.