Statistics of changes in lead node in connectivity-driven networks.

We study statistical properties of the highest degree, or most popular, nodes in growing networks. We show that the number of lead changes increases logarithmically with network size N, independent of the details of the growth mechanism. The probability that the first node retains the lead approaches a finite constant for popularity-driven growth, and decays as N-phi (ln(N)(-1/2), with phi=0.08607 em leader, for growth with no popularity bias.