[alistairSH]

Everybody traveling to the US needs a VISA, unless they have a waiver, which requires an ESTA, which requires some personal contact information. I don't know if the social media info will be added to the ESTA application, but it wouldn't surprise me. The visa waiver program also only applies to about 35-40 nations (there are 190 or so in the UN).

[ephimetheus]

There has been a section on social media accounts on the ESTA application for a while, but it was optional at least up to now.