How to motivate visitors to comment?

When we browse a website or a blog.Sometimes we may make some comments.So,if I am the host of blog or website.How to motivate vistors to comment and increase user experience?

Actually,commenting is all about context. A few examples of websites encouraging people to generate content.

• On a social platform like Facebook, asking "What's on your mind?" in the new-status box is an interactive, clear and concise way to hint as to what is to be written.
• On a knowledge-sharing, social platform like Quora, indicating topics of interest to the users is likely to prove as motivation to the users to write an answer.
• Medium has a unique commenting interface wherein people don't comment on the entire article as a whole but instead comment on particular sections or snippets
• Reddit has a similar strategy in place for those wanting to comment on specific clippings. Selecting some text and then pressing reply will quote the original text with the users reply beneath.
• And so on
  
  
  
  
  So, when we take ux design into consideration,summarising:
  
• The key here is being interactive
• People like to share opinions. Encourage that behaviour within your articles (you could include an opinion of yours in the article and ask people who differ to state in the comments their reasons for that) (this could be difficult in a technical IT blog, but not impossible).