blogs vs boards

Blogs are for a specific group or person to place ideas and post and receive visitor comments.  Visitors don't start messages  and only the owner post to people they want to see it. To deliver a message.  Boards are used to solicit feedback and generates dialogue between users in a group.  They are a more open, less monitored environment with more activity that everyone can engage in. I think they are both useful depending on who is using it and for what.  If I want everyone's opinion on something I want to go to a board but if i have something to say to a particular group only, then i want a blog.