Remember the part in the film Julie & Julia, when Julie is so excited about the first comment on her blog only to find out that its her mother? Who then said she seemed to be her only fan? But then, as her blog takes off, she gains many random readers who start to send her letters and ingredients for upcoming recipes. This motivates Julie Powell and renews her sense of purpose through her blog. When confronted with difficult recipes, her husband says something to the effect that she doesn't really have to cook it because no one would ever know! However, Julie responds, "But my readers would know!" She felt she owed it to her readers to be accountable and follow through on her original goal.
I can see how thoughtful and encouraging comments can continue to refresh and energize the author to continue writing or to continue with their goal. Even though commenting on each others posts is early in this list of Things, I hope we can still comment on each others blogs during the long stretch (Thing 17ish?) to pick each other up and motivate each other to finish!
This will especially be helpful for students because they LIVE for feedback! I can see students coming back to their blog/post multiple times in the day to check if anyone has posted a comment on their blog. Hopefully they will put more time and effort into their posts because it's being read by a larger audience.
As adults, we've anguished over our blog identities, templates, colors, fonts, etc... and I bet we smile when we get that email notification that someone has just commented on our blog (or maybe that's just me?). Imagine how our students will feel!