Establish a start time
Establish and in the introduction post a clear start and end time when you’ll stop replying. If the thread starts to really take off, having that clearly established will help you manage the audience's expectations. If you don’t, people will expect you to reply all day long. If the comments are coming in quickly, you can take a break and come back later to answer some more questions (say, for dinner). If you do that, be sure to establish when you’ll be back and when you’ll be going offline again. If people see you answering questions again they can start asking you questions and hoping for a reply.
Don't get discouraged!
Don’t be discouraged if there are only a few questions or comments, especially leading up to the event. AMAs are hard and for your first time, they can be overwhelming. Reddit is a massive community and making a dent there isn’t easy. On the day of the event you should have more questions than you did leading up to it.
Be aware that the actual AMA doesn't happen on the same page as where it's oringially advertised. On the day of the AMA, a link to the actual page will show up in the right sidebar of the subreddit. Clicking that will take you to where the AMA will take place. In there, you should find more questions than were posted on the announcement page.
Have thick skin
On Reddit, some people hide behind anonymous or throwaway (meaning they use it once and never use it again) user accounts so they can post whatever they’d like. Don't be surprised if some people post jokes or negative questions or comments.
There is a chance that uou might see a small, round, yellow icon with a star in it next to your name, particulary after you make a reply to a post. The post could be highlighted with a faint yellow background. If so, you've been awarded Reddit Gold. This means some has paid (or tipped) Reddit $4 to thank you for an particularly insightful reply. The effect will last about a month (Reddit Gold holders will also have an ad-free Reddit experience). Common courtesy is to publicly thank Reddit for Gold.(top)
You don’t have to answer all questions if you don’t want to or can't get to them all. If a comment or question is negative you can skip it.
Don't feed the trolls
Don't attack anyone making a question or comment that attacks you. It will make you appear reactionary and depending on how sensitive the content, can cause you to lose your position as the subject of the AMA.
Clarify or skip questions you don't know the answer to
Be sure of your replies. If you're not sure of the answer to a question, skip it or reply to say so. You can also consider having the commenter to rephrase their question. Whatever you do, don't post false information. Reddit can sniff that stuff out and immediately throw it in your face. Combined, the community is really smart and you should treat them as such.(top)
Be sure to share the AMA on all relevant social media networks, both through your faculty as well as through the author's network (if they have one).(top)
Have a team to help
Even if it's not your first AMA, you should have at least one other person in the room to help you out. Another person can help spot and/or organize questions that the subject of the AMA can consider answering and contact someone else if something happens that you're not sure of.
A shared Google doc
Create a shared Google doc that you and your team can edit and post to. On that Google doc, start by posting vital links that might come up during the AMA like Twitter or Facebook links, links to the related faculty, and things like that.
The Google doc is also important becuase you can copy and paste specific questions that the author can refer to, which can be handy if the number of questions coming in proves to be too many to keep up with.
Establish a method of communication with your team
If your team isn't all in the same room, set up a seperate Google Hangout or use the chat feature inside Google docs to share information and keep one another up to date on posts you've seen, and things for people to keep in mind as the AMA continues.(top)
Once the AMA is over, get a screengrab of the entire page so you can record it for the future. Further, re-visit the page the next day to compare the results with the new ones.
Have the team sit down and discuss what worked and what didn't. If you have any special insights, feel free to share them with email@example.com so we can update this document!