Luckily most places have 2FA so giving them the password to Facebook or Gmail is "only" equivalent to logging in so they can look around then and there. They can't look around once you have passed the border, and they can't sabotage you by setting a new password unless they keep your device or actually change the 2FA settings. I think that's pretty rare.
I honestly don't think they need/use/keep passwords after I pass through. They may want to look in rare cases, but I actually think it's more of a "control question". If you don't have a normal set of social media accounts you are not normal or you are hiding something. If you aren't willing to show it, you are hiding something. What you are hiding doesn't matter. They use it as a "tell" to see if you need to be investigated further.
These questions have always existed. They ask you what your business is entering the country etc, but they are as interested in whether you are sweating as they are in what you respond. Same here. They don't need to see your family photos they need to see you give up your privacy like a "normal person"
I honestly don't think they need/use/keep passwords after I pass through. They may want to look in rare cases, but I actually think it's more of a "control question". If you don't have a normal set of social media accounts you are not normal or you are hiding something. If you aren't willing to show it, you are hiding something. What you are hiding doesn't matter. They use it as a "tell" to see if you need to be investigated further.
These questions have always existed. They ask you what your business is entering the country etc, but they are as interested in whether you are sweating as they are in what you respond. Same here. They don't need to see your family photos they need to see you give up your privacy like a "normal person"