The current ESTA Visa Waiver form [0] (for non-residents visiting the country) asks for social media usernames, although they're currently marked as "Optional".
> Enter information associated with your online presence, including the types of online platforms, applications and websites that you use to collaborate, share information, and interact with others, as well as the username(s) associated with those accounts. (OPTIONAL)
With the length of time and the amount of sites I use I'd be here hours filling this in. I love NYC and have family in the states but I really can't imagine willingly going there now. Though the UK is hardly going the way of anything better.
edit: Actually Dec 2016 / Jan 2017 https://www.theverge.com/2016/12/22/14066082/us-customs-bord...