If you type
[so] in chat, it auto-expands to "Stack Overflow". This is a problem in http://chat.stackexchange.com/rooms/95/english-language-usage, since you might type "so" in brackets to indicate an editorial change in a quote.
This happened in this chat message.
The same behavior occurs in comments (including on EL&U).
Disable the expansion for
[So], at the very least on EL&U and its chat rooms.
Note that you can still use the
[SO] expansion for Stack Overflow. I expect most people already use the capitalized abbreviation for SO anyway.