You can certainly refer to the FAQ, cite facts from it, and quote it
within reason. But you can't legally reproduce large parts of it without
the author's permission. After all, the author may want to publish it
himself or herself one day. Unfortunately, the legal limit on how large a
part you can use is set only by the ill-defined doctrine of fair use. So
you just have to use your best judgment.
Q. This FAQ is so great, I want to pass it on to my mom. Is that OK?
No. It's very bad Netiquette to modify another person's work. Email a
polite note to the author of the FAQ explaining the error you found.
Chances are that if you're correct, the author will want to use your
information. You can send a separate note to your mom, as well.
