What is the difference between a blog and a journal?

This is a quick verbal distinction between the two course tools

Blackboard Blog

A blog fosters communication between and among students, and also mayeb the instructor. A blog belongs to a group of students and is meant for commentary by everyone else in the class. Best for public discussion and posts that are meant to be shared.

Blackboard Journal

A Journal is an on-going reflection or record of events by an individual or set of individuals.  A journal is designed to be private communication between a student and the instructor. Best for private entries read only by instructor.