http://snap.stanford.edu/snap/index.html
The SNAP library is focuses on the analysis of large social and information networks. Data collected from: Epinions.com, LiveJournal, Slashdot, Wikipedia, Enron email, Arxiv High Energy Physics, US Patents, Google, Amazon, Gnutella, roads from PA/CA/TX, Gowalla, Brightkite, Twitter, Memetracker, etc.
Databases include:
Social networks: online social networks, edges represent interactions between people
Communication networks: email communication networks with edges representing communication
Citation networks: nodes represent papers, edges represent citations
Collaboration networks: nodes represent scientists, edges represent collaborations (co-authoring a paper)
Web graphs: nodes represent webpages and edges are hyperlinks
Amazon networks : nodes represent products and edges link commonly co-purchased products
Internet networks : nodes represent computers and edges communication
Road networks : nodes represent intersections and edges roads connecting the intersections
Autonomous systems : graphs of the internet
Signed networks : networks with positive and negative edges (friend/foe, trust/distrust)
Location-based online social networks : Social networks with geographic check-ins
Wikipedia networks and metadata : Talk, editing and voting data from Wikipedia
Twitter and Memetracker : Memetracker phrases, links and 467 million Tweets
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