I have many, many twitter acquaintances I have literally no other way to contact (many I don't even know their actual names). So yes, dependent in that it's an

I have many, many twitter acquaintances I have literally no other way to contact (many I don't even know their actual names). So yes, dependent in that it's an independent, non-duplicated social graph, completely disjoint from other social graphs. Leaving it would, in fact, cause an ill effect in my life (multiple ill effects, actually), just as withdrawing from any social group.