Web 2.0 tools for teachers

RoSE’s answer is that people seeking knowledge do not necessarily want to go to either a document (a “document-centric” approach) or a person (a “social- network” approach) as their first point of access—though they will take either.  More ideal is an online environment that allows them to seek out documents and people in the context of relationships between the two (e.g., of authorship, reception, affiliation, recommendation, sponsorship, commentary, rebuttal, etc.).