Really, at this point just go the extra inch and add the 's.
"My friend sent me this pic from Seoul, S korea. I wish i knew what the buttons were for."
Correct me if I'm wrong, but I believe the Addams Family started when Uncle Fester farted.
"Really bored while driving from S. Carolina to CT in the rain."
This is the DJ that invented record scratching.
I got bored at "S"