I think commenting is important! By commenting you can help the author learn more about their post and you can ask questions (to gain more information). I follow several blogs about gardening and cooking. I ask questions a lot! It has given me a better understanding of the post.
I have left comment on several blogs from our group. I have connected with several people to share more ideas! I think commenting is fantastic for teachers...at least me, I love to steal ideas and sometimes I need to ask a few questions for make a few comments.
I have left comments on the The Pioneer Women and Learning to Live. It is a wonderful way to connect with authors!