When you write a comment, you usually just want to get it over with so you put something like " like ur blog, cum visit mine" , but that's  not proper.  When you write a comment you want it to be like you're writing a paper, it has to have correct spelling, punctuation, and L.A.R.K (legal, apropriate, resposible,and kind) or K.A.R.L.  Second, putting things like smiley faces and not a real comment is not really up lifting because you just put a smiley face, no "Wow that is really cool, I like how you told me about your favorite thing to do, and your funniest moment.".  Third, you shouldn't give out personal information, because someone can hurt you if you do.  That is what makes a comment good.