Make your website a communication hub by activating "message boards." These can be added to any page on your website, and can be public, or private.
Control who can post and what can be posted
Each web page on your site comes with the option to allow "comments." Turn this feature on, use it strategically, and you have a fine, functioning message board! You determine what types of people within your organization can post messages and comment. And you can require posts to be approved first, if you choose.