On Line Presence:

The point of frequent message is not information sharing; it is emotional connecting. They are ways of saying to one another, “I’m here, “you are there” … (D.N.)

OPO. In this section we give only a brief description of its main components. For more details please refer to OPO Specification. The main concept in OPO is the OnlinePresence. OnlinePresenceComponents are used to define different dimensions of a user’s presence in the online world and describe the nature of the Online Presence. The Notifiability component can be used to declare willingness of a user to receive notifications from applications (on which he/she is logged); the FIndability stands for the ability of other users to find his/her contact details in public listings while OnlineStatus represents the IM status, used on IM platforms. OnlineStatus in turn, has its own components that enable more precise descriptions of different statuses used by IM platforms. Those components are: Activity, Visibilty , and Contactability

The need for Semantics:

Interoperability among app

Integration among location, online statuses, status messages, activities

Interaction – adapting interaction to the state of presence