Live blogging has several useful components to it. While it is true that spelling and syntactical errors appear, as does text message spelling, the writing itself is raw and unedited, and for some, more real. The level of engagement goes just about through the roof since the students are involved in conversations in a medium in which they (mostly) feel comfortable. One student remarked that he wished they could live blog every day because he was enjoying it and learning quite a lot.
For second language learners, live blogging enables them to participate in the conversation at their own pace and rhythm. Being able to scroll up and down the screen to review others' postings and comment on previous observations opens the doors for them in a manner in which traditional classroom conversations may not enable. This also holds true for students that are generally shy and even for those who process information more slowly. In many ways, live blogging is one of the more valuable classroom tools that I possess.