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[PDF] Paper: Social networks that matter: Twitter under the microscope
A study of social interactions within Twitter reveals that the driver\nof usage is a sparse and hidden network of connections underlying the "declared" set of friends\nand followers.
The Real Twitter | The Noisy Channel
Many people, including scholars, advertisers and political activists, see online social networks as an opportunity to study the propagation of ideas, the formation of social bonds and viral marketing, among others. This view should be tempered by our findings that a link between any two people does not necessarily imply an interaction between them.
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While the standard definition of a social network embodies the notion of all the people with whom one shares a social relationship, in reality people interact with very few of those “listed” as part of their network.
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a more important input variable than the number of followers, they explore the friend graph, which turns out to be much sparser than the follower graph.
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150 friends is all you really need: Dunbar's number - Wikipedia, the free encyclopedia
Dunbar's number is a theoretical cognitive limit to the number of people with whom one can maintain stable social relationships. ... No precise value has been proposed for Dunbar's number, but a commonly cited approximation is 150.
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