"- Expand acronyms and abbreviations when they're
first introduced in a question. Not everybody knows
what the PAC-10 is."
Maybe it's just the
PAC-10, but certain items are better known by their
nicknames than their real names, and it would seem
unnecessary to require a question to say "Name this Pacific
Ten school" rather than "Name this PAC-10
school".
I can see doing this for answers (either should be
acceptable), but I'd leave it to the authors to determine what
abbreviations are acceptable and which aren't.