The first part of my self-study involved my signing on to or observing various Internet discussion groups that were specifically geared toward school media specialists. I was not surprised to learn that there were such narrowly-defined groups out there; heck, if you can join TAOGM-L ("The Art of Game Mastering" -- a discussion group for people who referee role-playing games) or post news to alt.carl.maldens.nose (the name says it all), surely a well-defined profession like school media would have at least a few different forums for discussion.
Internet discussion groups, ideally, exist to facilitate communication between folks with similar interests and problems. This discussion is not at all like sitting around a table with everyone in the group. It's more like playing phone tag and always getting the other person's answering machine. You leave a message and hope someone will get back to you. If someone with some initiative, time, and the right information gets your message, you'll get a response.
This one-way communication is a little tricky. The sender of a message can't see body language or field questions from the audience, and so has to do extra work for the message to communicate as clearly as with two-way communication. This is true whether the message is a question ("Do you allow students to eat lunch in the LMC?") or an answer ("Yes, but with certain restrictions").
The other restriction is that Internet communication is written, not spoken. Some of the nuances of spoken language (such as voice inflection) are lost in the process of typing a message. What looks perfectly harmless to one person can seem menacing or ironic to another. You might put something in ALL CAPS to emphasize it, but your reader might interpret that as shouting. Making the written word sound like the spoken word is difficult, but many people learn to type in a "chatty" style that sounds like a conversation instead of a lecture.