I've got an FAQ plugin (Ultimate FAQ) for a WordPress site with tons of content (like 30 questions each with a page full, multi-paragraphs, of answers with good info — stuff Google LOVES.)
Right now, I have a main FAQ page that has 3 categories and about 10 questions under each category and each question is collapsed by default. You click an arrow to expand it to reveal the answer.
I then have a single category's questions also displayed at the bottom of an appropriate related page. So…