Hi,

U.S. Customs and Border Protection (CBP) wants to begin asking foreign
visitors to the United States for their social media accounts. This
proposal threatens not only the free speech rights of foreign visitors, but
also those of their families and anyone who’s spoken with them via social
media.

http://www.freepress.net/blog/2016/08/10/a-dangerous-proposal-from-us-customs-and-border-protection

That's what Thailand has done, too.

Poomjit