It's easy - just select the desired access level, copy this link and send it via email, instant message, etc.Link: Just a link to your wiki. Post this anywhere and people can ask you for the invite key.
Use Blackboard's Adaptive Release feature: select a course in Blackboard >>control panel>>course documents>>create or select a document>>manage>>adaptive release
Establish interaction boundaries (know when to stop)
Separate out components of syllabus online. Policy, Grading, Schedule, keeps syllabus from appearing so long. Helps students find the information quicker.