These comments don't mean any harm but they are the conversational equivalent of someone who only ever says -yes / no / don't know. You feel like you are dragging words out of them. Examples on blog sites are

• great site
• good post
• enjoyed article

So how do you add the value into the conversation?

Basically you can say whatever you want but think about what you want readers to do after reading your post.

For example if I have written a post about 'looking after new born kittens' I may also want them to read another article on 'kittens at 6 weeks old' so I get the following comment.

- good article I've just got a kitten.

My reply: Glad you enjoyed the article and great to see kitten owners here, you will probably be interested in this article that I have as well on looking after kittens at 6 weeks onwards here (with link). If you want to sign up to my newsletter I'm going to be tracking the progress of these new borns right into adulthood and this should be a great opportunity to share stories which you may wish to do.

Now you could be (cynically) thinking this was someone who really has no interest in kittens. But I'm not replying to this person.

Remember every comment you make you are talking to your wider readers, not just the individual. I am using this as an opportunity to tell everyone that there is a newsletter, why they could benefit from it and what to expect in the future. The comment could have said 'great article', 'good post', or 'enjoyed article' and I would have said the same thing as above for any of them.

So short and sweet is good, because it's basically a blank sheet for you to add a bit of your own promotional content and direction for readers of that particular blog.