Leonard J Matthews via Compfight  

First off if the person made a mistake you should not be mean. If someone makes a mistake like spelling a word wrong you should start off with a compliment, then tell them what they did wrong politely. The next rule is correct grammar. You don’t want to look like a idiot when your commenting on blogs so use correct grammar. Another rule is try to make a connection to what the blog was about. The forth rule is don’t have a dead end comment. Try to  comment something that the writer can follow up on it. Don’t use too much punctuation like to many !!! or ??? it makes your comment look stupid. The last rule is ask to put more information about what the blog was about.