BFS Large Facebook sample

        -------------------------
        v. 1.0 of March 25th 2011
        emilio.ferrara@unime.it
        -------------------------

The BFS sample has been acquired using the well-know "breadth-first search" visiting algorithm.

The dataset "breadth_first-messina-sample" is simply structured as follows: each line represents an (undirected) edge
connecting two users which are connected by a friendship relationship in the Facebook graph.