I think you could easily justify something like this as a "travel mode" not just for border security, but "in case your phone is lost/stolen while traveling".

I think you could easily justify something like this as a "travel mode" not just for border security, but "in case your phone is lost/stolen while traveling". Make it so you have full or enhanced access to very recent stuff (photos, status updates, etc.) from the trip itself, and don't have access to as much from before the trip. Help defeat localization settings in the place where you're traveling, and get tourist/visitor-specific ads instead of local ads. Value for the user (usability and safety) as well as for the social media network and advertisers. The other form of this which would make sense: worksafe mode or public mode. If you're logging into your facebook/twitter account from a public computer, perhaps it doesn't have as full and unlimited access, and doesn't have access to non-reversible account actions, and strongly logs out. If you're logging in from a place defined as "work", it doesn't have notifications, certain groups, etc. (the "giving a meeting presentation on your laptop when a racy notification from spouse pops up" problem).