A do follow blog is a blog that allows users who comment and include their own website in the details to earn Google rating for that website. Which will improve their website position on Google search.
The problem with that concept is that it is abused by spammers, by going do follow you will have numerous comments on every blog post but 99.9% of it would be spam disguised as a legit comment.
משחקים ברשת אינדקס אתרים תוכנה לניהול עסק שיווק באינטרנט מערכת ניהול תוכן