Before you insult read the post I already posted.  In every international airport in the US, border patrol oversee returning passengers from overseas.  The lawyers say it is legal and common practice to ask for access to social media.  They say they can detain you, keep your phone, but will have to let you in after long delay. https://www.reddit.com/r/legaladvice/comments/cyr3g3/i_am_an_american_citizen_yesterday_at_lax_i_was/