Matt put a good question on his blog last week in response to Paul’s post. I just read the question again and realized that I had missed something the first time I read it.
“Why make learners go through the cognitively challenging task of reading, comprehending, thinking of a response, composing the response, and finally typing the response?”
There is benefit to forcing users to take the time to read, comprehend, think and then compose a response. There are times when that is not important, but sometimes it is and the designers of social software should consider what is important for the tasks they are supporting as they make decisions about what kinds of interaction to support.