As the article will address later, Backchannels give a voice to students that may not speak in a group setting.  Sometimes the shy students that will never raise their hand or answer very quietly when they are called on actually flourish when given the chance to "talk" on a Backchannel.  Students are able to begin with an idea and add to those ideas based on what other students wrote which helps take the pressure off each student.  

The students could not only use Backchannels individually, but in groups if they wish.  As the article mentions, the questions would be documented.  Students that were absent could get a record of questions and answers that were asked during class that day.  This could be very beneficial since that student may have the same questions as other students' that were in the class.  

Lu, Great point! I agree that students do miss more than just the material when they are absent. Thank you for sharing the article! To this point, I have not used Backchannels a lot for several reasons, but I like the ideas given in the article suggested. My favorite is to assess prior knowledge. What an engaging way to find out what students already know about a topic!

Depending on what type of Backchannel is used, students could be typing their ideas in or out of class so they would have the opportunity to think about their answers and post them as long as they posted them before the due date or discussion date.  By having more students participation to the conversation, other students as well as the teacher may see different perspectives on concepts that they may have never thought of before.  Something that was not mentioned in this article is that students need good up front rules about Backchannels before beginning the activity to prevent them from thinking they can use it to speak to each other like they do in social networking.

Lu, I have used Backchanneling during a presentation (I used Google Sites), and literally had to make it part of my students' grade that they ask the presenter a question during the presentation in order to get them to type in it! I teach high school in a rural East Texas school. My students told me it would be rude to type while the presenter was talking! While that may have been unusual, I think the key is to set boundaries up front with the class for what is to be discussed during a presentation. In my opinion, multiple conversations should not really be occurring during the presentation. We used to to communicate a question to the presenter while he/she was presenting. Sometimes, when students hold questions to the end, they forget their question. The presenter can choose to answer immediately or answer all questions at the end, but the presenter has all the questions typed out. On the privacy of the students' comments, my initial thought was that their comments would be saved securely on the school's server and only shared with that class. However, I could see where that could go awry so I looked up a some sites that spoke about archiving. Backchannel Chat indicates the teacher should have students use "appropriate" display names (http://backchannelchat.com/Benefits). However, on sites such as Google Sites, students log in so names would need to be changed if the conversation was going to be archived.