There are two distinct types of blogs...
One is the more traditional style where the owner express their thoughts and ideas, while other members input their occasional comments.
The other is the chat room style blog that holds conversation of anything and everything. Typically light-hearted dialogues. Perhaps these conversations can be held in the chat room... but I think this method works better since we come from so many different time zones, people do not go online at the same time.
I personally like having these two styles in MBTIc. Sure it drifts away from the traditional role for blogs, but it keeps members of the forum connected.