Blogs and wikis often operate within a set of unexpressed, taken-for-granted rules. These rules work by promoting or supporting certain types of interaction while discouraging or prohibiting others.
Source: Christopher D. Sessums
The same would be true for forums, Moodle, Drupal, Plone, and other content management systems. To what extent is there a “correct” social environment for a particular interaction goal? What is the relationship between the tool structure and the norms that develop within them? Are the norms for Wikipedia different than the norms for a Moodle wiki?