|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.
• 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 ...