Metta is an exocortex OS: it is your external memory and social interaction agent. This is the primary task aside from the additional multimedia and mobile assistant abilities. Some exploration of this task is carried out in a peer project MettaNode.
As an exocortex, operating system’s task is to provide means and ends to sharing and gathering relevant information for you.
As an information gathering assistant the OS must support receiving, filtering, classifying and presenting relevant information in a suitable form.
As an information sharing assistant the OS must support specifying privacy levels, distributing the secure storage, publishing directly to your peers and to other media.