I don't automatically assume that the mere "SF" means San Francisco, CA, USA, first and foremost to everybody in the world. And the full "San Francisco" exceede

I don't automatically assume that the mere "SF" means San Francisco, CA, USA, first and foremost to everybody in the world. And the full "San Francisco" exceeded the 80-character limit; dropping any other word would have lessened clarity. So, I chose what I thought was the best unambiguous abbreviation. Perhaps it was a poor choice; mods are welcome to reword it any way they like. "Frisco" would have fit, but SF denizens tend to go nonlinear upon its use.