I'm curious how this is supposed to work for Facebook, or an Instagram or Twitter account set to private. What good is a username if no content is publicly available?

Naturally, it would seem to follow then that if all the State Department is asking for is the username, and this isn't just for show, they must have some other method of access, presumably an agreement with social media companies, clearly spelled out somewhere down in section 27b.6 of the TOS.

But then what about WeChat? I somehow doubt Tencent is going to have the same relationship with the US State Dept. that Facebook does.