Structural Influence B C 2.5 25 2.0 2.0 2.0 co28 至::[:至 型0.5 0.5 Contact ma已边m-e 1. J Gander, L Backstrom, C Marlow, J Kleinberg. Structural diversity in social contagion. PNAS, 2012, 109(16)5962-59668 Structural Influence 1. J. Ugander, L. Backstrom, C. Marlow, J. Kleinberg. Structural diversity in social contagion. PNAS, 2012, 109 (16) 5962-5966