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http://spark-public.s3.amazonaws.com/sna/datasets/week1/LadaFacebookAnon.gml
http://spark-public.s3.amazonaws.com/sna/datasets/week5/gnutella2.gdf
https://spark-public.s3.amazonaws.com/sna/netlearn/nw/howwhysmallworlds.html
http://cs.carleton.edu/faculty/dlibenno/papers/lj/lj.pdf