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Table 4 Average similarity for snapshot t=4 of pairs forming new links between t and t+1 (either non-reciprocal, uv or reciprocal, uv ), compared with the average similarity of all pairs at distance 2 at t

From: Link creation and information spreading over social and communication ties in an interest-based online social network

  n cb σ b n cg σ g
d u v =2 9.5 (0.2) 0.02 1.12 (0.61) 0.05
uv 12.9 (0.16) 0.04 1.1 (0.6) 0.08
uv 18.5 (0.06) 0.04 1.67 (0.44) 0.11
Simple closure 18.2 (0.09) 0.04 1.81 (0.45) 0.1
Double closure 23.4 (0.03) 0.05 2.2 (0.36) 0.12
  1. Single and double closure refers respectively to new links uv and uv that close triangles. The similarity is measured by the number of common books n cb or groups n cg , and by the corresponding cosine similarities σ b and σ g . The numbers in parenthesis give the probability to have similarity equal to 0.