Blog Posts are used by Project Leads to make Announcements to the project team.  

Project leads can create Announcements in a projects, here is how.

1. Click Create and select Blog Post
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2. Click Create and when finished select Publish.
3. Blog posts are then listed in the News &  Announcement page tree section of the project.  The most recent announcements are listed first.  
4. All project members automatically receive announcement notifications.