Both students and instructors can easily add short bio's of themselves. The important thing about this feature is that it is 100% optional for students.
While the instructor can see the contact information and address's for his students, that information is not viewable by other students taking the course.
It is up to the specific student if they want to share personal contact information with another student or all the students in the class. We feel this is an important security feature of our program.