Consultation: individual looks for information at a central information store. E.g. Google
Allocution: information is distributed from a center simultaneously to many peripheral receivers. One-way communication. E.g. TV
Registration: the reverse of Consultation: the organization at the center receives information from a participant at the periphery. The accumulation of information at a center may or may not take place with knowledge of the individual. E.g. Cookie
Conversation: individuals interact directly with each other bypassing central controls or intermediaries. Individuals choose their communication partners as well as the time, place, and topic of communication. E.g. Skype