  Recent work has found that the propagation of behaviors and sentiments
through networks extends in ranges up to 2 to 4 degrees of distance. The
regularity with which the same observation is found in dissimilar phenomena has
been associated with friction in the propagation process and the instability of
link structure that emerges in the dynamic of social networks. We study a
contagious behavior, the practice of retweeting, in a setting where neither of
those restrictions is present and still found the same result.
