What is ubiquitous communication?

Ubiquitous Communication can be broadly defined, but not restricted to, the process by which communications between multiple agents can happen simultaneously and without the restrictions of time. For example, a face to face conversation can only happen once, at one time. Posting a status update on Facebook, allows the communication to pass from the person who posted the status to anyone else within his or her network. The status becomes Ubiquitous, as it does not rely on the person receiving the Status to access it at a particular time, or location.

This concept is still in development, and is likely for debate.