The worst thing that could happen to you if you own your own blog is having comment spam. When I first started blogging a couple of years ago, I was rudely introduced to comment spam. I had over 150 junk messages from poker, casinos, sex, porn, drugs and just about anything in this planet. Thanks to how Google rank websites. The more links you have, the higher the ranking. So, I spent a couple of hours deleting the spam comments.