An answerboard may be useful as a tool in our library for students to post questions in which library staff, as well as library members can answer questions (but of course not doing the actual homework/assignment). We can put questions to the public about our services or an event we had and get feedback from our patrons - a bit like a survey. I looked at one of the questions someone posted in Yahoo7answers and I must admit I liked the responses that amounted to "Do your own homework" - the person wanted to know what the themes of Macbeth were and what scenes they can be found in.