GraphRank

GraphRank is a subset of the Facebooks EdgeRank. It is made up of Coefficient (or Affinity), Weight, Interactions (most likely similar to interactive Edges in EdgeRank), and Time Decay.

The equation is most likely nearly identical to EdgeRank.

Coefficient (or Affinity) is the relationship between users who share several interests, or have high activity between the two.

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 * GraphRank