As an advantage, it gives you an outlet to share your personal thoughts and could be a stress reduction strategy. On the other hand, if you market yourself using the internet, using social networking sites, blogging, or a business website, you need to be very careful what kind of personal stuff you're putting out there, because when someone Googles your name, they're going to be able to read your personal blog. I think they're fine, as long as you filter the information that you put on a personal blog - be sure you're not damaging your reputation.