I'm working with a team on an educational iPhone app, and one of the proposed features is to have a "ask a question" button, which will let mobile users post a question to an online site. A group of volunteers would monitor the website and answer questions.
Is there a good, preferably free, web application that would provide this? I would love something like to license Stack Exchange for this, but the topic of the app is not widely popular enough to get approved as a public Stack Exchange site.