Today at her seminar Lucy quoted Brian Bloomfield on the boundaries that the use of a technological system can create for thought. The system in question is in the UK National Health Service, but the point is very relevant to social software (such as weblogs and wikis):
Once we had embarked upon the journey afforded us by the system, only a certain terrain was open to inspection; we could debate the the features of that terrain as made visible through the menus, records, and displays of the information system, but we could not switch the machine off and debate alternative landscapes; we could zoom in on details down to the level of records pertaining to individual treatment regimes for a given patient, or pull back and purview the architecture of the database as a whole, but we could not escape the boundaries implicitly defined by using the system.