I have to confess, I don't really know what to do with this thing. Sprout seems quite nice, the interface is easy to use, although ever so slightly slow (not bad for a web app though).
I created a 'personal sprout':
I have just been reading Wellman's Little boxes, Glocalization and Networked Individualism. I particularly like the discussion of specialized roles. In this section, Wellman uses scholarly academics as an example of how some people like to maintain contact through the written word (specifically email in this case) in order to be able to live their lives according to their own rhythm whilst still being able to communicate within a network of individuals.