This is a good question!
I' m responsible for students in distance education system and find problems with the web 2.0 tools.
Teachers workshops media do not offer the necessary explanations for a good understanding for pedagogical use in the classroom.
But this is necessary for the universities which are located in pre school.
These are the two extremes of necessary innovation.
If you ask me what basic knowledge for students to correctly use web 2.0 tools in school, I submit this link.