http://misadventuresinlearning.blogspot.com/2011/05/astd-ice-2011-astd2011-backchannel.html
My note: the term "backchannel" refers to an online conversation that takes place during some online or in-person event.
Here's the "authoritative" Wikipedia definition:
"Backchannel is the practice of using networked computers to maintain a real-time online conversation alongside live spoken remarks.
"The term "backchannel" generally refers to online conversation about the topic or the speaker. Occasionally backchannel provides audience members a chance to fact-check the presentation.
"First growing in popularity at technology conferences, backchannel is increasingly a factor in education where WiFi connections and laptop computers allow students to use ordinary chat like IRC orAIM to actively communicate during class.
"Twitter is also widely used today by audiences to create backchannels at technology conferences."
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