The internet works in a strange way. Each time your reply to an online comment, you are fuelling its popularity. This is because you are introducing new material on the same topic.
The search engines, and in particular Google give priority to ‘live’ issues which means that each time a comment is being added to a thread, it helps the thread to climb up the search engines’ ladder, which ironically is exactly the opposite of the result that you would want to achieve.
Furthermore, (and this is from my experience as a soldier) Read More On Internet Defamation Lawyer‘s blog
Social media lawyer Business Talks 
i agree with your opinion, Community management is better way for e-reputation