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Networked Life by Mung Chiang

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6 Why does Wikipedia even work?

Now we move from recommendation to influence in social networks. We start with consensus formation from conflicting opinions in this chapter before moving on to a collection of influence models in the next two.

But first, let us compare the four different “consensus” models we covered in Chapters 36, as visualized in Figure 6.1.

•   Google’s PageRank turns a graph of webpage connections into a single rank-ordered list according to their importance scores.

•   Netflix’s recommendation turns a user–movie rating matrix into many ranked order lists, one list per user, based on the predicted movie ratings for each user.

•   Amazon’s rating aggregation turns a vector of rating scores into a single scalar for ...

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