this is a great idea actually. or simply manage fake social media accounts with a fake persona that you update semi frequently either by hand or through an automated script. Login to these accounts upon arrival, then switch back to your real ones when you're clear.

It's a serious offence to present a fake identity to US Border Patrol.

They're very clearly not meaning an entirely different identity, but instead some sandboxed, non-personal phone space.

i do use multiple profiles on my android phone where the main one is not the one i actually use. I wonder if they would catch that as its kinda obvious if you know to look for this but actually somewhat hidden if not...