Nessa, Just wanted to say Darren Rowse from Problogger is really good. I've read some of his articles and always found them very helpful. Of course, I like this one on how to comment. Now to put it into practice!
Just want to add this "story": Two years ago, there was a thread on Apartment Therapy about Etsy. I forget the exact initial post statement but it allowed people to list their favorite Etsy items. A good 70-80% were Etsy folks who just left links to their own shops or item link from their shop--not even with a comment. I listed 4 items from shops I really liked with comments of why I liked them, and ended in a clear statement an item from my shop. For the first several months, a week didn't go by when I didn't get views via that thread and it continued for over a year. Even a few weeks ago, I got a view! That to say, a good comment is better than a poor one, giving credence to the articles above.