Pretty interesting question - I don't know Dunbar's view, but I can see two ways of looking at it: one: that the functional social group is the primary thing to

Pretty interesting question - I don't know Dunbar's view, but I can see two ways of looking at it: one: that the functional social group is the primary thing to be measured, and people who you aren't physically around very often, and who you need a database to remind you who they are, wouldn't properly be part of that; two: that the notion of functional social group should now be expanded to include these very people, and that the relation Dunbar was interested in (proportionality between social group size and neocortex size, viz: https://en.wikipedia.org/wiki/Dunbar%27s_number https://en.wikipedia.org/wiki/Dunbar%27s_number) needs to be adjusted to regard databases of friends as an extension of the neocortex :)