The chatter moderation criteria/rules appear to only impact Chatter forums and not Chatter Answers. I can create a trigger on Questions and Replies for Chatter Answers though. I haven't found a way to access the blacklisted words in the keyword list which is populated in the moderation criteria area for Chatter.
I'd like to avoid having two blacklisted word lists, one for chatter forums and one for chatter answers. Any ideas for a solution?