Tim Challies has written a post titled "Encouraging a Blogger".
I think its an honest and great post, I loved the first suddestion he makes;
"Leave a Comment. This is likely the easiest thing you can do but it can be very encouraging, especially for people whose blogs do not receive a great deal of traffic. Simply leave a comment, noting that you read and enjoyed the article. If you feel there was a problem with the article, leave a comment and the reason you disagreed. Simply knowing that an article is being read can be a real blessing to a blogger."
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It is good to encourage each other and I intend to put this in action in the future to those who's blogs and posts I enjoy!