Not social media. We've had this discussion in the past and I haven't changed my opinion since that discussion.
This is not difficult. Let's say I had a Twitter account @I'vehadenough and I was visiting the USA. They don't need to know I have a twitter account and have referred to those from the USA as paranoid. There are no lie detector tests and there are no clairvoyants and I volunteer the information I want to volunteer not what they think I should volunteer. It really is that simple. Not even worth debating.
AFF is difficult. The link is on my smartphone and logs straight in. Same for email. Same for Flyertalk. If they take phone off ne there is nothing I can do to stop them.
Either way I am not afraid of Big Brother. I am an individual. I decide what information I volunteer.