Have you ever visited a blog and see that readers have made comments on a post, but the owner of the blog does not respond? When I see that, it makes me think the owner of the blog does not care about their readers. They do not want to build relationships with their current audience to build credibility and loyalty. How does that appear to new visitors to their blog? Will they want to return to a blog that makes them feel unimportant? I'd say the answer is, "No."
