Degree distribution of the Twitter friendship graph.

<p>Main plot: Degree distribution within the friendship network. In the inset: cumulative degree distribution in the friendship network (red) and out-degree distribution of the users not restricted to the 5.8 million sample (green). The jump in the green curve is due to Twitter policy of limiting follows up to 2000 users in case of a disproportionate in and out degree ratio <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0111973#pone.0111973-Twitter1" target="_blank">[34]</a>.