this is tips, if you can search backlink with blog commenting
just open google.com, baidu.com.bd and type
site:.com inurl:blog "post a comment" -"comments closed" -"you must be logged in" "Change with your keyword"
site:.org inurl:blog "post a comment" -"comments closed" -"you must be logged in" "Change with your keyword"
site:.edu inurl:blog "post a comment" -"comments closed" -"you must be logged in" "Change with your keyword"
site:.gov inurl:blog "post a comment" -"comments closed" -"you must be logged in" "Change with your keyword"
site:.com "powered by expressionengine" "Change with your keyword"
site:.org "powered by expressionengine" "Change with your keyword"
site:.edu "powered by expressionengine" "Change with your keyword"
site:.gov "powered by expressionengine" "Change with your keyword"
site:.com “Powered by BlogEngine.NET” inurl:blog "post a comment" -"comments closed" -"you must be logged in" "Change with your keyword"
site:.org “Powered by BlogEngine.NET" inurl:blog "post a comment" -"comments closed" -"you must be logged in" "Change with your keyword"
site:.edu “Powered by BlogEngine.NET” inurl:blog "post a comment" -"comments closed" -"you must be logged in" "Change with your keyword"
site:.gov “Powered by BlogEngine.NET” inurl:blog "post a comment" -"comments closed" -"you must be logged in" "Change with your keyword"