Don't forget you are now expected to hand over twitter, Facebook and other social media handles before travelling to the US as well, and that's as a UK/EU passport holder...
Absurd if true.
The entire form starts with copy that goes something like "by filling out this form you waive any right to privacy". It's extremely aggressive. The US hates foreigners.
(source: my first and only trip to the US some 3 years ago)
Furthermore, it isn't only illegal things thst could get you singled out. If I remember correctly, a simple facebook post accusing the US to be war criminals and the greatest threat to peace was used to deny someone entry.
(On mobile atm. will update with sources in 4 hours)