Answer boards are a fantastic idea for a library especially for students and general inquiry questions from the public. this would help a lot of people who have left their assignment to the last minute and need some help urgently such as a book review or help with a understanding a question as a librarian will be on the end to help them as soon as possible.
This would also be good for people who want to rate the services provided by the library as they can tell the libray worker and this can be assessed or put up for a poll for people to comment on.