Uniform Large Facebook sample

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        v. 1.0 of March 25th 2011
        emilio.ferrara@unime.it
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The UNIFORM sample has been acquired using the "Rejection Sampling" technique
described first in 
Gjoka et al.
"Walking in Facebook: A Case Study of Unbiased Sampling of OSNs".

The dataset "uniform-messina-sample" is simply structured as follows:

    each line represents an (undirected) edge connecting two users 
    which are connected by a 'friendship' on the Facebook graph.