If a prospective client is looking for information about local realtors, many of them look to the internet as a source of information to base their decisions on. The internet is a great place to start when clients are looking to find someone to represent them in the house buying or selling process, after all.
However, when things become hairy is when you use your business blog or a blog that is traceable back to you in a way that attacks another person or people who believe in a different ideology. Not only this is bad for business, it could also potentially end up with a lawsuit, as the Fair Housing Act prohibits discriminating against people for race, color, religion, sex, familial status, national origin and disability when it comes to housing.
Your blog can be looked at as an extension of your personality; it can be an ideal way to let your clients (or potential clients) get an idea about who you are as a person. Don't just blog about boring old stats, let people know what's going on in your area! The average person doesn't want to read a pile of graphs about housing statistics; they'd rather have you tell them in your own words.
Today, it seems like everybody and their dog has a blog of some sort. So, you think, what can a real estate blog do for me and my business? The answer is: a lot, if you are willing to put in the time and effort to make it so.