“facebook.com and apple.com becoming dominant brokers or
gatekeepers […]. These blog service providers, corporate
social network sites, and online hosting services sites are in ‘control’ of the flow of
information providing access to information with better opportunities to spread
information. These corporate sites could refuse to pass on the communication and
block flows of information.”

From

Countering the Social Ignorance of ‘Social’ Network Analysis and
Data Mining with Ethnography