You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Another generally interesting thing is... everyone is so nice. The level of friendly positive small talk between strangers is like 10x more than in SG, it seems like. I imagine this must make socially awkward people feel 10x worse. It’s probably less bad to be awkward in SG 
I found this too, people in SF more friendly to strangers generally, more friendly than London. SF also felt way smaller than London (which it is). I was mostly in Mission for my stay (it’s awesome - recommend)
