twitter social network dataset

http://law.di.unimi.it/datasets.php

A comparison of state-of-the-art graph processing systems

https://code.facebook.com/posts/319004238457019/a-comparison-of-state-of-the-art-graph-processing-systems/

Linkedin graph database

https://engineering.linkedin.com/teams/data/projects/search-and-discovery https://engineering.linkedin.com/teams/data

Why I left Apache Spark GraphX and returned to HBase for my graph database

https://lbartkowski.wordpress.com/2015/04/21/why-i-left-apache-spark-graphx-and-returned-to-hbase-for-my-graph-database/