Siri thinks the city on my Facebook is one of my home addresses
I figured this out, more or less. On iOS 10 on my contacts card, I was able to edit the identification my phone gives the Facebook address by scrolling down to the connected accounts section of my contact card and editing the Facebook content there. However there is a bug and even after I'm done editing the only options are "edit" and "cancel" but not something to save it.

So instead I went to macOS, opened my contacts card there, edit my information there more easily, and it sync'ed to my iPhone, so Siri works properly now.