How to Hold a Facebook Q&A
Plan your Q&A in advance by creating a Facebook event to promote the session to your fans. They can invite their friends and will be notified by Facebook when your Q&A is starting.
You can invite a public figure to answer questions in your Page’s Q&A sessions. Just make sure that both Pages like each other, and tag the other Page in the opening post of the Q&A.
Every Q&A session is unique; you may receive tons of questions during one session and only a few during others. If you find that you are receiving too many questions to be able to answer them all, choose the ones you want to respond to and remember that you can “Like” any questions you find interesting, even if you can’t answer them.
When your Q&A is over, be sure to mention that it is done and remember to thank your fans for participating