I travelled to the US recently for the first time in 20 years or so. I had to apply for a Visa waiver (ESTA) and from memory they had a social media section that was flagged as "optional". I'm not big on social media and decided that my rarely used accounts would be of no use or interest to anyone. If I remember correctly though I did put my Github account on there (unless my memory is playing vicious tricks on me, yes Github was listed). Call me crazy but I decided that if the US government was interested in my C++ chess code, great!

I did gird my loins for a horribly unwelcoming experience at the airport (semi off topic but widely discussed here). At JFK it was actually super nice, but we were first off the plane and there was no queue to hit. We did take a side trip to Canada and had to enter the US again at O'Hare and that was a different story entirely. Seemingly a million planes arriving at once. Even miserable looking and bemused cabin crew queuing from here to eternity. When we finally got to the head of the queue(s) the over-worked, under manned staff were perfunctory but non unpleasant. I haven't seen anything as disorganised and shambolic in arrivals at a European airport ever, but maybe I've just been lucky.