Reading Gina Trapani's guide to web blog comments has helped me understand a bit more, and her point on know when to comment and know when to email hit a chord.
Many of the comments I read on blogs are more like two-way conversations and don't necessarily contribute to a multi user discussion and I feel I am already guilty of the same sin. I've just commented on the FO2010 blog with a question to Sarah, something that was probably more relevant to drop in an email to her.
I am planning to actively follow some of my fellow learners' blogs, but for this to work for me I have to make it a weekly activity which I think will be made easier by using the Blogger Reading List . I just don't have time to read several blogs a day.